Stand tall with your core braced, a neutral spine and your feet slightly wider than shoulder with. Hold a long resistance band directly in front of you, pulling it taut. The band should be resting on your thighs. Keeping both arms straight throughout the movement, slowly bring the band up and over your head until it's directly behind you. With control, reverse the movement to bring the band back to the start position, maintaining that straight-arm position and locked out elbow throughout. As your mobility improves, work to reduce the width of your grip whilst still maintaining full range of motion for the exercise. Be sure not to compensate for lack of mobility in your shoulders by flaring your rib cage or arching your back when performing the movement. Keep your rib cage down and squeeze your glutes. Repeat for the recommended amount of reps (or time).