One-Arm Kettlebell Swings
Main muscle: Hamstrings
Other muscles: Glutes, Shoulders, Lower back, Calves
Equipment: kettlebells
Mechanics type: compound
Fitness level: intermediate
Category: Increase strength

Place one kettlebell between your feet. Push back with your butt and bend your knees to get into the starting position. Make sure that your back isflat and look straight ahead. Swing the kettlebell between your legs forcefully. Quickly reverse the direction and drive though with your hipstaking the kettlebell straight out. Let the kettlebell swing back between your legs and repeat. Switch arms with each set.

Pictures And Videos Courtesy Of artofstrength.com.
Source: bodybuilding.com