Grip a kettlebell firmly in your right hand, place your left hand on your hip and stand with your feet shoulder width apart. Move your right foot back until the toe of your right foot is in line with the heel of your left foot. With a slight bend in your knee, slowly hinge your hips back, inhaling as you do so and keeping a neutral spine. Focus the tension on your left leg whilst letting the right leg bend naturally and stay relaxed. Keep your arms extended and the kettlebell close to your body throughout. When your hips have hinged as much as possible, proceed to reverse the movement. Drive your hips forward with force, squeezing your glutes and hamstrings as you do so and exhaling. Pause for a count of one at the top, keeping your glutes tensed. Then begin the second portion of the movement: bend at the knee, slowly lowering your body until your front knee is bent at roughly 90 degrees. Inhale as you do so. Keep your torso upright the entire time. Pause at the bottom of the movement, then extend your knee and return to the standing split stance start position. Repeat from the beginning. Perform all the requried reps on one leg before changing to the other.