It's supposed to say "So here are some facts: 1. There are about 3500 calories in one pound of fat. 2. Every two jumping jacks = 1 calorie burnt. 3. 7000 jumping jacks = 1 pound gone. 4. 10 sets of 100 jumping jacks for 1 week will burn one pound. So on top of your current diet and exercise regime, you can add on 10 sets of 100 jumping jacks. Let's try this, because a pound lighter is a pound lighter."
3,500 calories is equivalent to 1 lb. You burn aprox 100 cals doing jumping jacks in 10 minutes. Translates to ~ 350 minutes/4 hours a week/50 minutes a day. Possible? Maybe. 10 sets of 5 minutes of jumping jacks every day for a week.
Keep the knees slightly bent and in line with your hips and feet. Engage your core muscles and your glutes and maintain a steady and smooth breathing pattern. Keep the arms extended and the elbows loose during the entire exercise. http://www.spotebi.com/exercise-guide/modified-jumping-jacks/