Let me help you out fourhundred. I have used many things throughout my track career. Just to let you know, I am running at a D-1 college, so I know a little. First off, Winstrol is good. try 50mg/ed. the tabs are better for runners because you won't get the bruises associated with the shots, plus you'll keep more speed. also Clenbuterol is another good one. this will strip all of the fat of your body and give you that ripped look the pros have. be cautious with this one though, the first few weeks you use it, it will make your heart race faster than you can believe, and if you have had heart problems or have them now, then DON'T use this one, it could possibly kill someone with a weak heart, because it speeds up your matabalism. also, don't use Clen with aphedren which is often found in Speed Stack and most fat burning supplements, stacking aphedren and Clen would hurt not help you.(Clenbuterol was desined for race horses to speed up their fast twich muscles and cut fat.) also a good one is Masstron, I use this when I need to put on lean, rock hard muscle, or to hold my weight when Im on a low calorie diet during the competition season. And with all of these, winstrol tabs take three to four weeks to clear the system, Masstron takes two to three, and Clenbuterol only takes four to five days.(very important the NCAA random drug tests) I will warn you though that Winstrol has been known to be detectible up to 6 months after last use, because it can be stored in fat cells and can occasionally be released sparatically, but this is not garanteed to happen to everyone. I hope this will help you and every other sprint brother on this board desperately looking for a way to shave off seconds or tenths. By the way I personally got my best gains when I stacked Masstron and winny 50mg/ed. But everyone reacts differently, and don't forget, no one is gifted enough to run a sub 45.0 400m or a low 10 without hard work and the hatred of loosing. no matter what chemicals you use.