"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." THE BODY IS a complex machine. Your corporeal form houses over 600 muscles, all working together to help ...

Level up leg day with the Jefferson split squat, also known as the 'barbell-between-legs split squat' (it doesn't quite have the same ring to it, does it?). A slight variation on the Jefferson squat – ...

Gymnastics was part of my life for more than half of it. We know gymnasts are strong; I've written about bodyweight moves I still do to this day. We know they're flexible — case in point: Katelyn ...

Take leg day up a notch with this no-nonsense single leg squat variation ...