Start with your upper back supported by a padded surface behind you (such as a bench or box) and a short band just above your knees. Place your feet hip width apart with your toes slightly turned out. Focusing the tension in your glutes, drive your hips up to full hip extension, exhaling as you do so. Make sure to keep your heels pressed firmly into the ground. Keep your chin tucked and eyeline looking forward throughout the movement. When your hips reach full hip extension, drive your knees out forcefully against the band. Pause for a count of one, keeping the tension in your glutes, then bring your knees back to centre and return with control to the start position, inhaling as you do so. Repeat.