Want to Torch Calories at Home? Try a HIIT Workout From One of These Top-Rated Apps

Cost: Free; Premium subscriptions start at $10 per month

Sworkit offers a wide variety of workouts for all fitness levels, including HIIT workouts that can be shortened if your schedule suddenly changes. While you can do a limited number of workouts for free, upgrading gives you access to more than 300 routines, as well as six-week fitness programs designed to help you reach your goals.