Stand with your feet shoulder-distance apart. Grasp a dumbbell in each hand or a medicine ball. Extend your arms down at your sides if you are holding dumbbells or hold the medicine ball in front of you with arms extended.
Take a large step diagonally forward with your right foot, planting your foot at the 11 o'clock position. Sink down until your thighs form right angles. As you bend your knees, curl the dumbbells toward your upper arms or the medicine ball toward your chest.
Extend your legs, lift your right knee and bring it in toward your chest, and lower your arms. Step back with your right leg, this time lunging behind your torso and stepping back to the 8 o'clock position. As you sink down into the reverse lunge, complete another bicep curl. This completes one rep.