In the video, Gaines, 46, dances around for a second before dropping to the floor to crank out sets of pushups—first on her ...

Everyone's body will respond differently to exercise. Experts say muscles indeed provide benefits but they are not an indication of overall fitness.

The 'Godfather of Bodybuilding' Charles Glass revealed his best protein source for gains and discussed his top exercise to build muscle.

ATHLEAN-X founder Jeff Cavaliere discussed how to effectively build better arms while sharing the perfect science-backed bicep workout.