Make sure you watch the video for this one. This classic exercise creates a maximum load for the hamstrings at full extension/length and a maximum load for the glutes at full contraction/shortest length. For these reasons, it complements hamstring curls for hamstrings and squats or deadlifts for glutes.
Set your kettlebell in front of you and bend knees to medium depth while hinging at the hips, keeping back straight, and reaching back with the glutes. Take hold of the kettlebell handle, and tighten your upper back. Swing the kettlebell back between your legs while hinging further at the hips. Squeeze your glutes as you swing the kettlebell up in front of you, vigorously unhinging the hips and coming to full lock-out in upright posture. Continue swings until the end of your set.