Strength and muscle size don't grow the same way — or from the same thing

Three reps at max weight isn't the best way to get bigger

Training for strength and training for size (hypertrophy) overlap but are optimized for different adaptations. Very heavy sets of 1–5 reps primarily train the nervous system — your ability to recruit existing muscle fibers more efficiently and coordinate them — which is why beginners see fast strength gains even without much visible muscle growth.

Moderate loads for 6–15 reps create more total mechanical tension and metabolic stress per workout — both more directly tied to muscle fiber growth itself. That's why powerlifters and bodybuilders, training differently, end up looking quite different despite both being technically 'strong.'

In practice, an optimal program for most goals combines both ranges: heavy sets for strength and neuromuscular efficiency, plus higher-volume moderate sets to stimulate the muscle fibers directly — either one alone works more slowly than the combination.