Beginner load increase: 5–10%/week
A beginner to resistance training can increase total training load (volume × intensity) by 5–10% per week, versus ~1% per week for advanced lifters.
Snapshot · The Peter Attia Drive
Building strength and muscle mass: how to optimize training, nutrition, and more for longevity (AMA #71 rebroadcast)
Explore episode
Jul 6, 2026
Where this was said
The difference between concentric and eccentric muscle contractions
At 45:35 · chapter starts 45:15
The mechanics of muscle contraction split into two fundamentally different training opportunities. The concentric phase — muscle shortening while producing force — is where power lives. The faster the concentric movement, the greater the power output. Peter describes his Keiser pneumatic leg press routine: explosive single-leg presses at roughly two-thirds of maximum load, stopping the set the moment power drops below 92% of peak. The eccentric phase — muscle lengthening under tension — is the real driver of hypertrophy. Slower eccentric movements create greater mechanical stress and more microtears, which are the stimulus for muscle growth. This is why bodybuilders exhibit meticulous eccentric control. Neglecting the eccentric is also the most common path to injury: letting the leg curl machine snap back, for instance, can tear a hamstring. Peter closes with a vivid example from his cycling days [1] — Peter Attia "The concentric phase builds force and power; the eccentric phase — the slow lowering — drives hypertrophy through mechanical stress and mic…" 46:00 : he used very heavy hex-bar deadlifts with deliberate drop sets — maximum concentric explosion, then literally dropping the bar and resetting with zero eccentric load — to build maximum strength without adding weight, since every kilogram on a cyclist's body is a penalty.
Concentric vs. Eccentric: The Underrated Half of Every Rep
The concentric phase builds force and power; the eccentric phase — the slow lowering — drives hypertrophy through mechanical stress and micro-tears. Neglecting eccentric control is one of the most common training errors, and it's a leading cause of muscle injuries.
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