well, that's a hard question. It is probably different for everyone. When I was on test, I didn't really feel anything too different, but I saw a difference in my body. After I inject and get that sweet oil taste in my mouth I always get amped and pumped, but that's just my mental state. When I ran tren... I felt like shit, emotionally I felt good, I was more confident and happy, but that was probably because it was working like a charm. Physically I felt like hell, insomnia, night sweats, lower back/should/shin cramps my shoulders would get a pump washing my hair.. My shins would feel like they were going to break if I had to walk fast through the store. Deadlifting was terrible, but I did it. I'd have to sit down sometimes on back days just until the pump went away. Man, but seeing my body change so drastically, seeing me grind out that last rep and murder PR's every week.. That stuff made it all worth it, all of the pain and suffering. I mean, it wasn't that bad, I'm going to do it again, but it was unnecessary pain and suffering. I didn't have to take it, but I did and I can't see myself doing a cycle without it.