Kneel down facing the TRX and hold the handles in each hand.
Ensure the straps are long.
Hold the straps taut, and position the handles under your shoulders, leaning your weight through your arms.
Step one leg at a time backward, lifting your knees off the ground.
Straighten your knees with your weight on the balls of your feet so that you are in a press-up position.
Ensure you keep driving the heels of your hands down into the handles so that you do not sink your chest down, or allow your shoulder blades to wing.
Maintaining this position with a straight line from the top of your head to your heels, alternate between moving one arm forwards and the other backward.