25 Ways to Burn 250 Calories in 25 Minutes Elizabeth Seward March 28, 2014 53332 Try these simple ways to burn calories fast and get the body you’ve always wanted. You want to lose a pound? For a 130 to 150 pound person, you have to burn about 3,500 extra calories a week. You could eat only kale salad and lemon water, walk on a treadmill for 86 hours, or you could burn calories fast by doing efficient, focused exercises for less than a half hour. You decide. If short and intense is your speed, here are 25 workouts that last 25 minutes and burn 250 calories. Just make sure to approach all of these activities with intensity so you don’t cheat yourself of the full calorie burn. Bicycling (14-16 mph) Basketball (full-court) Full-contact football Jumping Jacks Push-ups Click here to view the next 5 calorie-torching activities.