If you've ever walked into a gym and wondered whether you're doing the right thing — the right exercises, the right number of sets, the right amount of weight — you're not alone. The fitness industry has spent decades overcomplicating strength training to the point where most people either do too much, do the wrong things, or just give up entirely.

I'm Adam Spang, owner of Ativo Fitness on Route 114 in Middleton, MA — about two miles down the road from Richardson's Ice Cream — and I've spent years building a training system based on what the research actually supports, not what looks good on Instagram or what some influencer swears by this week.
And now, the largest review of strength training research ever published just confirmed what we've been doing all along.

In early 2026, the American College of Sports Medicine (the gold standard in exercise science) released an updated Position Stand on resistance training. Their team reviewed 137 systematic reviews covering more than 30,000 participants to answer a simple question: what actually matters when it comes to getting stronger, building muscle, and improving how your body performs?

The answers might surprise you. Because a lot of what the fitness industry obsesses over? It doesn't matter nearly as much as you think.

Here's what does.

• The Big Picture: Strength Training Works
• What the Research Says Actually Matters
• Train at Least Twice a Week
• Lift Heavy Enough to Challenge Yourself
• Use Full Range of Motion
• Volume Matters — But Not as Much as You Think
• Include Power Training
• Eccentric Loading Enhances Muscle Growth
• Exercise Order Matters for Strength
• Training to Failure: Not Necessary
• Periodization: Less Important Than You'd Think
• Equipment Type: Machines vs. Free Weights
• Time of Day, Rest Periods, and Set Structures
• Why Most Gym Experiences Get This Wrong
• What Smart Strength Training Actually Looks Like
• It's Safer Than You Think
• The Real Barrier Isn't Knowledge — It's Environment
• FAQ
  • How many times a week should I strength train?
  • Do I need to lift to failure to see results?
  • Is strength training safe for people over 40 or 50?
  • What's more important — the exercises I do or how I do them?
  • How long does a good strength training session need to be?
  • What is small group personal training?
  • What makes Ativo different from a regular gym?

The Big Picture: Strength Training Works

Before we get into the details, let's start with the headline finding: strength training works. Period. Across every age group, every experience level, and nearly every outcome measured — strength, muscle size, power, balance, walking speed, the ability to get out of a chair — resistance training made people better.

That sounds obvious, but here's why it matters: only about 30% of American adults do any form of strength training at least twice a week. Nearly 60% do none at all. And those numbers are even lower for adults over 50
So the single most important takeaway from 137 studies and 30,000 participants isn't about sets or reps or tempo.

It's this: doing strength training, in almost any form, is dramatically better than not doing it. The gap between "nothing" and "something structured" is enormous. The gap between "pretty good programming" and "theoretically perfect programming" is tiny by comparison.

If you're reading this and you're not currently doing any structured strength training, that's the thing to fix first. Everything else is optimization.

What the Research Says Actually Matters

Out of all the variables you could manipulate in a strength training program, the research identified a handful that consistently made a measurable difference. Here's what the evidence says matters most.

Train at Least Twice a Week

Strength improved significantly when people trained at least two days per week compared to one. At Ativo, we program three sessions per week for our members, enough to drive serious progress without burning people out or taking over their lives.

For the busy professionals and parents from Middleton, North Andover, North Reading, and across the North Shore who make up most of our membership, three hours a week is the sweet spot. It's enough to build real strength and keep you moving forward. It's not so much that it competes with everything else you've got going on.

Lift Heavy Enough to Challenge Yourself

The research found a clear dose-response relationship between load (how much weight you're lifting) and strength gains. In practical terms, that means your training needs to be progressively challenging. If you're still lifting the same weight you started with six months ago, you're leaving results on the table.

This is one of the core beliefs at Ativo: progressive load is the requirement for real strength. Not just showing up and sweating. Not doing random exercises that make you sore. Actual, measurable progression on movements that matter.

We track every member's loads and progressions so that your training is always moving forward, even if it's in small increments. That's what separates a program from a workout.

Use Full Range of Motion

Strength gains were enhanced when people trained through a complete range of motion. Partial reps and half-squats might let you move more weight, but they don't produce the same results.

This is why coaching matters. Every session at Ativo, our coaches are watching your movement quality and cueing you toward full, controlled range of motion. It's not about being perfect — it's about being intentional. And it's one of the reasons we keep our sessions small. You can't coach range of motion in a room with 30 people.

Volume Matters — But Not as Much as You Think

For strength, two to three sets per exercise was sufficient. More than that produced diminishing returns. For building muscle, the threshold was higher — around 10 or more sets per muscle group per week showed enhanced hypertrophy.

Here's the practical takeaway: you don't need to live in the gym. A well-designed program that hits the right volume in about an hour, three times a week, covers it. That's exactly how we structure training at Ativo. Every minute is accounted for. No filler. No wandering around wondering what to do next.

Include Power Training

This one is often overlooked, especially for people over 35. The research found that power training — movements where you intentionally move the weight quickly during the lifting phase — enhanced physical function outcomes like walking speed, getting out of a chair, and overall movement quality.

Think about what your body actually needs to do in daily life. Catching yourself when you trip. Hauling gear up and down the bleachers at a MASCO football game. Standing in the Richardsons' line for 45 minutes on a hot Saturday in July, and still having energy to chase your kids around the mini golf course. All of those require power, not just raw strength.

At Ativo, every training session includes a power block. Med ball work, explosive movements, fast-tempo lifts. It's built into the programming because the research says it matters — and because we see it make a difference in how our members move and feel outside the gym.

Eccentric Loading Enhances Muscle Growth

The eccentric phase of a lift — the lowering portion, where you're controlling the weight on the way down — was found to enhance muscle hypertrophy when given extra emphasis. This means controlling the tempo of your lifts, not just heaving weight up and letting it drop.

We program specific eccentric tempos into our training cycles. It's one of those details that most people wouldn't notice unless they knew what to look for, but it's the kind of thing that separates evidence-based coaching from guesswork.

Exercise Order Matters for Strength

Exercises performed at the beginning of a training session produced greater strength gains than the same exercises performed at the end. This makes intuitive sense — you're fresher, more focused, and can push harder when you're not already fatigued.

This is why our programming is sequenced intentionally. Compound strength movements come first, when you have the most energy and focus. Accessory work and conditioning come later. It's not random, and the order isn't an accident.

What Doesn't Matter as Much as You Think

This is where it gets interesting — and where a lot of the fitness industry's favorite talking points fall apart.

Training to Failure: Not Necessary

One of the most persistent myths in strength training is that you need to push every set to absolute failure — that grinding, shaking, can't-move-the-weight-one-more-inch feeling. The research is clear: training to momentary muscular failure does not produce better results for strength, muscle growth, or power.

What does matter is effort. Getting close to failure — leaving about two to three reps "in the tank," as coaches say — is enough to drive adaptation. Our coaches use RPE (rate of perceived exertion) and RIR (reps in reserve) cues to help members find that sweet spot: hard enough to matter, smart enough to recover from and come back for the next session.

This is especially important for the 35-to-55 demographic we work with. You don't need to destroy yourself to get results. You need to be consistent, and consistency requires that your training doesn't leave you broken.

Periodization: Less Important Than You'd Think

Periodization — the systematic manipulation of training variables over time — has been a cornerstone of strength training philosophy for decades. The research found that when progressive overload is present, periodized programs are not significantly better than non-periodized ones.

That doesn't mean structure doesn't matter. It means the magic isn't in the periodization model — it's in the progressive overload underneath it. As long as your training is getting harder over time in some measurable way, you're on the right track.

Equipment Type: Machines vs. Free Weights

The research found no significant difference between machines and free weights for building strength. Both work. What matters more is that you're training with appropriate load, full range of motion, and progressive challenge.

We use both at Ativo, and we choose based on what makes sense for each member and each phase of training — not based on some arbitrary hierarchy of "real lifting" versus "machine work."

Time of Day, Rest Periods, and Set Structures

Morning versus evening training? Short rest versus long rest? Cluster sets versus traditional sets? Drop sets versus straight sets? None of these variables produced consistent differences in outcomes.

This is liberating, honestly. It means you can train when it fits your schedule, take the rest you need between sets, and not obsess over whether you're resting for exactly 90 seconds versus 120. The fundamentals — load, volume, range of motion, effort, progression — matter far more than these fine-tuning details.

Why Most Gym Experiences Get This Wrong

Here's the problem: most gyms don't design their training around any of this.

Big box gyms hand you a generic program on day one and then leave you alone. There's no progression tracking, no coaching on range of motion, no adjustment of loads based on how you're adapting. You're essentially paying for access to equipment and figuring out the rest yourself.

Boutique fitness classes — the spin studios, the HIIT factories, the "total body burn" places — prioritize entertainment and exhaustion over actual training principles. They change the workout every day so you never get bored, but that also means you never progress. There's no tracking, no periodization, no deliberate loading strategy. You just show up and sweat.

Neither of these approaches reflects what the research says actually drives results.

The ACSM's position stand makes a point that deserves more attention: previous guidelines may have required training for 20 or more hours per week to develop general muscular fitness according to the outlined criteria.

That's not realistic for anyone with a job and a family. The updated research shows that well-designed, efficient programs — built around the variables that actually matter — produce substantial results in far less time.

That's the model we built at Ativo Fitness. Not because we read this paper and decided to change what we do. Because this is what we've always done, and the science just caught up.

What Smart Strength Training Actually Looks Like

If you've never experienced what evidence-based strength training feels like in practice, here's what a typical week at Ativo looks like for our members from across the tri-town area, North Andover, Andover, and North Reading:

You train three times a week, about an hour per session. When you walk in, your program is ready. Your coach knows what you did last session, what loads you hit, and what's on deck for today.

Every session starts with movement prep designed for your body — not a generic five-minute jog on a treadmill. Then you move into your power block: explosive, intentional movements that train your body to produce force quickly.

After that, your main strength work. Compound movements with loads that are appropriate for you — not the person next to you. Your coach is watching your range of motion, cueing your technique, and making sure you're working at the right intensity. The loads go up over time because your program is designed to progress, not just to fill an hour.

You finish with accessory work and conditioning that supports your main lifts and your goals. Everything is tracked. Everything has a purpose. And when the training cycle ends, a new one begins with updated baselines and fresh challenges.

That's what the research says works. And that's what our members experience every time they walk through the door in Middleton.

It's Safer Than You Think

One of the biggest reasons people — especially people over 40 — avoid strength training is fear. Fear of injury. Fear of doing something wrong. Fear that they've waited too long and their body can't handle it.

The research addresses this directly. In an analysis of more than 38,000 participants, including over 11,000 older adults, exercise did not increase the risk of serious adverse events. The risk of minor issues — temporary soreness, fatigue — was no different between strength training and aerobic exercise. And cardiovascular complications occurred far less frequently during strength training than during cardio.

Strength training is safe. For healthy adults of all ages. Full stop.

What makes it even safer is having qualified coaches who know what they're doing — who can modify exercises for your bad shoulder, adjust loads when something doesn't feel right, and progress you at a pace that matches your body, not someone else's timeline.

That's exactly the environment we've built at Ativo. We employ only full-time fitness professionals with extensive floor hours. We keep our small group personal training sessions small enough that every member gets real coaching, not just someone counting reps from across the room.

Whether you're driving over from North Andover, coming down Route 114 from Topsfield or Boxford, or popping in from North Reading, you're getting coached, not just supervised.

If you've been telling yourself you've waited too long, or that strength training is risky at your age — the science says otherwise.,

The Real Barrier Isn't Knowledge — It's Environment

The ACSM's position stand makes one more point that I think is the most important of all: the researchers argue that individualizing programs to increase participation in strength training is more important than conforming to specific prescription criteria.

Read that again.

The world's leading exercise science body is saying that getting people to actually do strength training matters more than the exact details of what they do.

This is what I've believed since I opened Ativo. The biggest problem in fitness isn't that people don't know what to do. It's that the environments available to them — the big box gyms, the overcrowded classes, the confusing app-based programs — make it nearly impossible to be consistent.

When you have a coach who knows your name, a program built for your body, and a community that actually notices when you're not there — consistency stops being a willpower problem. It becomes automatic.

That's what we do at Ativo Fitness in Middleton, MA. We make strength training work for the people who've tried everything else and couldn't make it stick. Not because they lacked discipline. Because they lacked the right environment.

If that sounds like you — or someone you know — we'd love to show you what training is supposed to feel like.

FAQ

How many times a week should I strength train?

The research supports a minimum of two sessions per week for strength gains. At Ativo, we recommend three sessions per week, which balances optimal progress with recovery and fits into the schedule of busy professionals and parents across Middleton, North Andover, North Reading, and the North Shore.

Do I need to lift to failure to see results?

No. The ACSM's review of 137 studies found that training to muscular failure does not enhance strength, muscle growth, or power. Training with high effort — leaving about two to three reps in reserve — is sufficient to drive results and is easier to recover from.

Is strength training safe for people over 40 or 50?

Yes. Research involving more than 38,000 participants confirmed that strength training is safe for healthy adults of all ages. The risk of serious adverse events was not increased, and cardiovascular complications were actually less common during strength training than aerobic exercise.

What's more important — the exercises I do or how I do them?

How you do them. The research shows that load, range of motion, volume, effort, and progression matter far more than specific exercise selection, equipment type, or set structures. A well-coached session with the right fundamentals will always outperform a random workout with fancy exercises.

How long does a good strength training session need to be?

About an hour is sufficient when the programming is well-designed. The research found that two to three sets per exercise produces strong results for strength, with diminishing returns beyond that. Efficient programming eliminates wasted time and delivers results without requiring hours in the gym.

What is small group personal training?

Small group personal training is a model where a qualified coach works with a small number of clients at a time — typically four to eight — so that every person receives individualized programming, real-time coaching, and progressive tracking. It combines the accountability and expertise of personal training with the energy and affordability of a group setting.

What makes Ativo different from a regular gym?

At Ativo Fitness in Middleton, MA, every member gets a personalized training program, coached sessions with full-time professionals, and progressive tracking of their loads and progress. We run structured training cycles, include power training and eccentric work in every phase, and keep our sessions small enough that our coaches know every member by name. It's strength training the way the science says it should be done.

Adam Spang is the owner of Ativo Fitness, a small group personal training gym on Route 114 in Middleton, MA, serving busy professionals and families from North Andover, Andover, North Reading, Topsfield, Boxford, Danvers, Peabody, Lynnfield, and across the North Shore. To learn more about training at Ativo, visit ativofitness.com.