No gym?And you want to step up your game?Find a wall,go upside down and put your t-shirt on.We need to dress up,no?Lol! And since you’re in this position,do some push-ups. Demonstration on my link up there . Great workout on some different upper body muscles .
This confinement makes you find all kind of ways to be creative in order to make it effective. Using your body weight is one of them. The intensity you put in your exercise will increase your heartbeat like this one did for me. I use to think that doing hours of cardio would do the job but a great resistance training will bring amazing results with less time.