Nitrox-ATP After A Heavy Workout - Nitrogen helps build muscles and nitrogen rich supplements like Nitrox-ATP are helping people get the physiques they want. With Nitrogen enriched pre-workout supplements and some good post workout supplements, you can get the muscles you want in no time. Nitrox-ATP and other supplements with Nitrogen help you to focus on your workout and make them more beneficial. Also remember to rest those muscles with some post workout supplements for the best results.