I did a lot of running/sprinting the day before and I slept about 6 hours but when I woke up I felt perfectly fine and not tired at all. Then we started doing warming up and I sweat way more than I normally do, all my speed was gone. A guy who I dominated in sparring now hit me a lot more since I was just too tired to go on the offensive. I also got hit in the nuts and that took away the rest of my energy. Anyway, is doing heavy cardio bad the day before training?
