i can tell you for a fact and u can laugh but tennis is a sport where you can get a huge edge when your on gear. when i take deca my serve is 10mph faster cause i can break my wrist twice as hard and it doesn't ever get sore. i can also put a lot more spin on the ball because of that. there is no comparison, thats why tennis players test positive for nandrolone more than anything else. also my boy does nhb fighting and he takes eq and says he has much more stamina when he is on it.