How to do it: Stand with your feet together, holding dumbbells. Shift your weight to your left foot and lift your right leg out to the side (about 45 degrees) as you perform a biceps curl by bending your elbows and bringing the dumbbells into your body.
Lower your arms and leg to return to your start position. Repeat on the other leg. That’s one rep. Do 3 sets of 15 reps.