Grab either kettlebells or dumbbells. Start standing with your feet together and pull your shoulders back and down away from your ears. Lift one knee up high, lean forward, and shift your body weight until you're falling forward. Catch yourself with that front leg and gradually absorb the shock of the landing. You're now in a lunge. Transfer the weight to the front leg, bring that back knee up, and repeat on the other leg. Take eight steps forward, turn around, and then take eight steps back.