You don't need a gym membership to perform kettlebell workouts, which are extremely versatile and can work every muscle in your body. Check your fitness app or look online for circuit trainings that really get your heart pumping. Kettlebell workouts also require more use of your stabilizer muscles than regular weight training, so you end up burning more calories and increasing your abdominal strength. One study found that these types of workouts allow the average person to burn 400 calories in 20 minutes + extra calories from EPOC.