WoodyAllen
Well-known member
https://www.thenakedscientists.com/articles/questions/why-do-muscles-get-bigger-after-exercise
...I go to the gym and I lift a very light load, I can do lots and lots of reps, and actually what I train there is more the endurance of the muscle. If I want to make the muscle bigger, what I’ve got to do is apply a heavier load but I can only do less reps, and what starts to happen is, and one of the misconceptions is that we increase the number of muscle fibres. It doesn’t happen in the human. What we get is a hypertrophy, we get an increase in the size of the fibre.