Starting in a split-stance position with one foot forward and one foot back, weight distributed evenly between the front foot and back toe, place the middle of a resistance tube underneath the front foot and grasp the handles as shoulder height. From this starting position, bend both knees and lower the body, bringing the back knee towards the ground, stopping just before the back knee touches the ground. Keep the front knee behind the front toes and keep the back in a neutral position, maintaining deep abdominal muscle engagement. Extend both knees and return to starting position. Inhale as you come down and exhale as you return to starting position. Switch sides and repeat the exercise on the opposite side.