The TRX Side Plank is progressed from a static hold to include floor taps. Start with a static hold reaching to the ceiling with the top arm. Lift hip and slowly lower the arm, reaching under the body to tap the floor. Return to extended position.
The TRX Tricep Press can be progressed by raising a leg and bringing it into the chest. If you are feeling any pain in the elbows raise your arms slightly. Make sure to keep your elbows pinched in by your ears as you bend and extend. Suck in that gut! Hopefully it is flat by week 12 and watch that arch in your spine.
Another alternative for the triceps is the TRX Preacher Tricep Extension pictured above. To do this, face the TRX and sit down on your knees with a pronated grip on the handles (palms down). Lean forward on the TRX holding the arms parallel and extended in front of your body at shoulder height. Point your elbows toward the floor and make sure your body is aligned. Increase weight on the handles by rocking forward, slowly lowering and bending the arms, feeling tension in the triceps. Adjust hip position over knees to alter the resistence.