You probably should run it by your doctor if you are still feeling faint three hours later. Lots of water might help, and your carbs may be a little too low for intense cardio workouts - I bumped my carb intake up when I started the BFL workouts a few weeks ago. Because I've really not done much cardio at all over the past few years I'm really slowly easing into it also. I started at 10 minutes and I'm only increasing the intensity gradually and for very short spurts and I'm not pushing it to anything that keeps me breathing hard for more than a minute. That and I'm over 40 and well I think I have to get my heart used to the idea of exercise.

Good luck and talk to your Doc

- MaryMac