Why one trainer calls the plank variation "no joke." ...

A fitness expert has revealed how long you should be able to hold a plank for, based on your age. A plank exercise is when you hold your body in a push up position, in a straight line, like a plank of ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Planks are a go-to exercise for delivering full-body benefits with zero equipment. “If done correctly, ...