STARTING POSITION:
Suspend your TRX at around knee height. Grab the handles in each hand and lean back. Maintain your body in a straight line and your arms fully extended retracting your shoulder blades. Contract your pelvic floor and core while keep your body straight.
MOVEMENT:
Pull the handles towards your torso until your hands are next to your ribs while you exhale. Return to the starting position with a smooth movement while you inhale. Make sure your shoulder blades are always retracted.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form. Alter your grip (neutral, pronated, supinated..) from time to time to train the muscles from multiple angles.