Muscle gels. Fire is one of the ways that I bring out muscle definition for a photo shoot video shooter If I just want to look awesome in the gym or on the beach, I just simply put it on my farms or whatever shows from my triceps, biceps and my delts and especially when there's any heat. So I could put this on. And then I put on my jacket. Or if I go out in the sun or I just work out a little bit. The heat, plus this will pull water out from underneath my skin, enhance the muscle definition, even just rubbing it in the friction off my hand against my skin. That little bit of heat activates. It enhances the muscle definition instantly.