All it takes is a tweak or two, and virtually any exercise for any muscle group can instantly become a core movement as well. It's all about positioning. One great example of this is the V-sit ...

People with double-jointed shoulders have unusual levels of flexibility in their shoulder joints. Having double-jointed shoulders may sometimes lead to chronic pain and injuries. “Double-jointed” is ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." All it takes is a tweak or two, and virtually any exercise for any muscle group can instantly become a ...