These mini-challenges you can do at your home and you don’t need any kind of equipment, just a little bit motivation. I have been combining these and attempting to do them all the days in one setting. The Wall Sits are the biggest obstacle.
Great cardio circuit with or without the treadmill running portion! You could also put these in between other body weight exercises to keep your heart rate up during HIIT (not that you necessarily need more cardio for that!