Is there any good exercise equipment available that you can buy that burn a lot of calories and are small?

Im looking for something that burns a lot of calories but still small enough that I could fit it in my room? My rooms very small. I heard of something that is a treadmill but is stairs too….like both and it burns a lot of calories. Does anyone know what it is called and how many calories it burns. Or anything else that works good?

I’m in the army. I’ve been through basic training, and it made me in the best shape I’ve ever been in my entire life. You don’t have to buy any exercise equipment to get in shape or burn calories. Push-ups, Sit-ups, and running every other day is all you need.