Hold a kettlebell (between 10 and 20 pounds) with your thumbs toward the ceiling. Lower down into a deep squat.
In the squat position, curl the kettlebell up toward your body. Be sure to keep your chest up throughout the entire movement. If you feel yourself getting pulled forward, switch to a lighter kettlebell.
Lower the kettlebell back down to the starting position and then stand up. This counts as one rep.