Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What makes the cells of the muscles contract? – ...

Fast-twitch fibers help with explosive movements like sprinting and weight lifting. Genetics and training influence the distribution of fast-twitch and slow-twitch muscle fibers. Doing strength ...

Supplement companies often claim peptides can amplify muscle gain and facilitate fat loss. But few studies have explored the impact of peptides on bodybuilding, and some are banned in professional ...