Grab a pair of 5- to 10-pound dumbbells and hold them with straight arms down at your sides. (You can also opt to do this exercise without weights.)
Stand about a foot in front of a sturdy bench, box, or step that’s 15 to 18 inches high.
Place your right foot firmly on the step so that your leg is bent about 90 degrees. Press your right heel into the step and push your body up until your right leg is straight. Keep your left foot elevated off the step. Lower yourself until your left foot touches the floor, and repeat. Do eight to 12 repetitions and then repeat the exercise with your left foot on the step.