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Movement & Strength

Movement and strength training — preserving lean mass and building sustainable activity.

16 articles · updated Sep 26

Guides

New
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The 10,000 steps myth: where the number came from and what actually counts
The 10,000-step goal began as the name of a 1965 Japanese pedometer, not as a research finding. Walking more does lower the risk of early death, heart disease and dementia, but most of the benefit arrives well before 10,000, and the curve has no cliff. Falling short is not failing, and brisk pace, stairs, short hard bursts and strength training each add benefits a step count cannot see.
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Joint pain on a GLP-1: why it usually gets better, why it sometimes gets worse first
Losing weight takes real load off your knees, and the trial evidence on that is strong. But plenty of people find their joints ache more in the first months, usually because they've started moving again on deconditioned tissue, or because rapid weight loss took muscle that was helping hold the joint together. This guide covers what the research shows, what it doesn't, and how to train around sore joints.
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A beginner's resistance-training plan on a GLP-1: sets, reps, and progression
A concrete beginner plan for the strength work you already know you should be doing on a GLP-1: the five core movement patterns, a simple 2–3x/week full-body template, beginner set and rep ranges, how progressive overload and reps-in-reserve work, and when to deload or bring in a trainer.
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How to find a personal trainer when you're on a GLP-1
Once you've decided a trainer is worth it, the next job is picking a good one. This guide covers what credentials mean, why GLP-1 experience matters, where to look, what to ask on a first call, and the red flags that should send you elsewhere.
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Should you get a personal trainer on a GLP-1?
You don't need a personal trainer on a GLP-1, but getting strength training right matters more than usual, because you're trying to lose fat without losing muscle. This guide covers who benefits most from a trainer, who can skip one, and the cheaper options in between.
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Weight loss vs. body recomposition goals on a GLP-1
Losing weight and changing your body composition are different goals, and they call for different strategies, even though a GLP-1 medication can help with both. This guide helps you work out which one you're aiming for.
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Why strength training matters on a GLP-1
Some of the weight you lose on a GLP-1 is lean tissue, much of it muscle: roughly 25-40% of the total in recent trials. Strength training, paired with enough protein, is the best-supported way to protect that muscle, and there's a good case for starting early in treatment.

Glossary terms

  • Osteoarthritis — The most common form of arthritis, in which the cartilage and other tissues of a joint gradually break down, causing pain and stiffness; excess weight is a major risk factor, especially for the knees.
  • Fat-free mass — Everything in the body that isn't fat — muscle, organs, bone, and water — measured as total body weight minus all fat mass.
  • Body recomposition — Losing fat while keeping or building muscle, so the body's fat-to-muscle ratio improves even if total weight changes little.
  • Resistance training (progressive overload) — Exercise that loads your muscles against resistance and is made gradually harder over time (progressive overload) to keep or build muscle and strength.
  • Muscle protein synthesis — The biological process of building new muscle protein, stimulated by resistance exercise and dietary protein intake.
  • Sarcopenia — The age- or illness-related loss of muscle mass and strength — a risk to monitor for during rapid weight loss.
  • Lean mass — Body weight from everything other than fat: mostly muscle, plus organs and water, and in the broad sense bone. On a DXA report, lean mass usually leaves bone out.

Resources

  • NASM (National Academy of Sports Medicine) — One of the largest certifying bodies for personal trainers in the U.S. It's useful on a GLP-1 because protecting muscle takes qualified strength-training guidance, and NASM offers a course on weight-loss medications (plus a broader Weight Loss Specialization) for trainers who work with clients on these drugs.
  • Physical Activity Guidelines for Americans — The official U.S. guidance on how much activity, including muscle-strengthening work, adults should aim for each week. The 2nd edition (2018) is still the current version as of September 2026.