"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." This 20-minute leg and butt workout is part of the Women's Health 30-Day Workout Challenge. For this part ...

Start lying on your back with your arms extended overhead. Exhale and roll up while lifting your left leg up, reaching for your toes before rolling slowly back down to the mat. Repeat with the right ...

Plyometric exercises require you to push yourself to your maximum effort through quick and intense bursts of energy like jumping, sprinting, lunging and hopping. They call on you to perform explosive ...

For a core- and glute-specific workout, you'll love this eight-move workout from ISSA-certified personal trainer and Under Armour trainer Sydney Torabi. It's quick (done in 20 minutes!), but intense!