You don’t need weights to get a challenging leg workout. The prone hamstring curl, demonstrated here by celebrity trainer Harley Pasternak and featured on his “Harley’s Hollywood Workout ...

A prone leg curl targets the hamstrings, for example. If you’re doing it at home, try using sliders or a stability ball. Or you can lay on the floor and hold a weight between your feet.

Holding a weight in each hand, as you lower your back knee to the floor, keeping a 90-degree angle in your front leg, curl the weights up to your chest, performing a bicep curl.