What muscles do Michael Phelps use?

Answer 1

Michael Phelps uses all of his muscels, as do all swimmers. He does, however, work his biceps, triceps, and leg muscles more often than any other. The stomach muscles are used usually only when he does butterfly, the neck muscles only when he breathes (usage depends on how much he breaths during practices and events), and the glutes every time he uses his leg muscles.