gym cardio interesting

"Forget about jogging around the block or struggling with sit-ups. Sex uses every muscle group, gets the heart and lungs working hard, and burns about 300 calories an hour." What do you think ??

I've never been a big fan of cardio. I find it incredibly boring and annoying. So I've been brain storming some ways to make my time on the cardio machine less so. Here is what I have come up with; - Change cardio machines every 10- 15 minutes - Check my email inbox and other messages( if I'm...