Pushups on the bench. If you’re not ready for ground pushups, you can use a wall or a bench. Start with elbows alongside the ribcage, keep that alignment, stay in a powerful plank position, bracing your core, this helps to stabalize the lumbar spine. Lower yourself down close to the bench, inhaling down, exhaling up. If this is too challenging, then take it up to the back of the bench or something a little higher that is manageable to perform full range of motion with proper form. The key is to maintain a strong active plank position. Quality of the movement is better that quantity of moment. To take a phrase from TRX training, earn your right to progress.