MUSCLES ENGAGED Abdominals The abdominal muscles (abs) provide movement and support to your core area. The deeper and closer to the spine the particular abdominal muscle is, the more effect over body posture it will have, and this often contributes significantly to a healthy back. Equipment Used TRX Trainer Suspension training is a type of fitness training that uses a system of ropes and webbing called a "suspension trainer" and uses your own body weight as resistance. Exercise Instructions Step 1 Start in a push-up position with your feet in the TRX straps, your lower back flat and your hands directly under your shoulders. Step 2 Using your abs, pull your body upwards into a pike position fully contracting your abs at the top. Step 3 Lower your body down to the starting position using with full control and repeat.