It goes beyond chest day.

U.S. Marine Corps Cpl. Justin Marsh, a rifleman with 2nd Battalion, 6th Marine Regiment, 2d Marine Division, performs a bench press during the human health and performance initiative on Camp Lejeune, ...

THE CHEST—AND the muscle-pumping workouts it encourages—takes up a great deal of attention for physique-minded guys. If you pause a moment to think about why, you won't need long to figure out the ...