TRX Lunge (Lunge, backward (alternate), with TRX)

Stand up straight with your feet shoulder width apart.
Shorten the straps and hold a handle in each hand.
Take a large step backwards with one leg, bending the front and rear knees until they reach 90 degrees.
Ensure your knees travel directly forwards as your arms reach up towards the ceiling.
Push through your buttock muscles to step the rear leg back to the starting position.