That said, I never want to give up on trying to do things better and more efficiently. So here's another sprinting problem: Some people have pointed out on this thread and others that if I'm even considering doing strength and sprinting in the same day, I'm doing one wrong. When it comes to sprinting, I don't know what else I could be doing right now - I run as hard as I possibly can for as long as I can. When I feel the speed tapering off after 10-15 seconds I stop. Sometimes I use a certain point up ahead like a light pole as inspiration to go as far as I can. At the end of the sprint, should I be sprinting so hard that at the end I'm hardly even breathing? Last night, right as I would come to the point that I thought I needed to slow down, I would press myself to squeeze out 5 more seconds or so, but that literally involved not breathing for those 5 seconds. During my typical sprint, I'm breathing hard and fast, but I'm still breathing. Sooo, what's sprinting too hard? How do I know I've truly done all I can?