Hold a kettlebell (between 10 and 20 pounds) in your left hand by your side.
Step your left leg behind you, coming into a reverse lunge, and then return to standing.
Once standing, lift the kettlebell over your head, maintaining a slight bend at the elbow joint. Don't let your arm swing out wide; instead, keep it close to your head. Lower your left arm back down to the starting position. This counts as one rep.