Get in pushup position with your feet in then TRX. Then walk your hands backwards, towards your feet until your completely perpendicular to the ground. At this point, squeeze your glutes together and press your abdominal muscles against the surface. Breathe consistently, yet shorter and choppier than usual. Complete 6-12 repetitions of pushups from this handstand position. Slowly lower yourself back into pushup position and rest on your knees.
Helpful tips and Tricks
Maintain short, choppy, breathing throughout the set. Save about 5% of your energy for the walking back of your hands into a safe position.