Begin by looping a long resistance band through the handle of a kettlebell and placing it between your legs. Take a stance that is about one and half times hip width with your toes turned out and position each end of the resistance band round your feet. Bend your knees and drive your hips back but don't allow them to go lower than your knees. Brace your core, keep your chest up and keep a neutral spine as you take a firm grip of the kettlebell with both hands and come to a standing position. Shoulders should stay back and traps should stay relaxed, with your arms fully extended gripping the kettlebell. This is your start position. With a slight bend in your knee, slowly hinge your hips back, inhaling as you do so and keeping a neutral spine. When your hips have hinged as much as possible, proceed to reverse the movement. Ideally you should not go further than 1-2 inches below the knee joint, otherwise you risk putting the load through your lower back and losing the tension in your hamstrings. Drive your hips forward with force, resisting against the band and squeezing your glutes and hamstrings - all the while exhaling as you do so. Pause for a count of one at the top, keeping your glutes tensed and ensuring not to lock out your knees. Repeat.