Here’s why cyclists need hamstring curls in their routine, plus the best variations.

Start in a supine position with your heels resting on a Swiss ball. Bend at the knees and raise your hips as you bring the ball closer to you. Return to the starting position without letting your hips ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Nordic curls are a bit of a gymgoer's party trick. As you lower the backside of your body backwards ...