Step 1: Stand upright facing the TRX anchor, keeping feet shoulder width apart, and holding onto the TRX handles with your arms extended.
Step 2: Bring your feet in closer to the anchor point, so you are now leaning back at around 30-45 degrees.
Step 3: From this leaned back, straight-bodied position, proceed to pull the TRX handles towards your ears, keeping your elbows pointed out to the side. At this point squeeze your shoulder blades together to feel the contraction of your back muscles (esp. Rhomboids)
Step 4: Lower yourself back down to the starting position.
Step 5: Repeat the movement several times.
How to progress the exercise
This exercise can be progressed by removing one hand from the TRX and trying to keep it up to the same level as the other hand. Weight can also be added to create more resistance for the upper back/shoulder girdle muscles. Finally, a balance disc or a BOSU can be placed under the foot for an added balance/stability challenge.
Make sure to avoid compensating by rotating your hips during this movement. The hips should always remain square to ensure the core and glutes and ankles are firing appropriately.