I mean that in a good way. I've read that if you do sprints hard enough to blast your super-fast twitch fibers, you can only do it two or three times a week. Hard to believe that four minutes of anything could do that. But a set of sprints leaves me tired (good tired) for a couple days. I do it as part of a 45 minute water aerobics session, but the rest of the session isn't that demanding. Of course, I am old and have a bit of heart trouble.
No announcement yet.
Sprinting kicks my butt. LOL