500 calorie abs and cardio workout

My latest workouts to my readers...Here's my 500 calorie abs & cardio workout. You might think that would involve thousands of crunches. Technically, you're right, because according to Men's Health magazine, it would take about 3,000 crunches to 500 calories (that's a measly 1 calorie for every 6 crunches that you do!). Of course, it would take you 50 minutes of doing straight crunches to do