Simple back exercise.
Start with tube securely under both feet, knees slightly bent, torso forward, and hands grasping each handle of the band.
Exhale and pull both handles in towards your hips, keeping your arms close to your body, and moving your elbows behind you. Hold for 2 seconds. Inhale and release back to start position.
Recommended reps: Do 10-12 reps and increase as you progress.