Answer:
jump rope: It's great cardio, burning about 220 calories in 20 minutes. Jump ropes are inexpensive, travel well, require no special skills, and can be used anywhere you have space.
burpees: burns 100 or more calories in 10 minutes (if you can stomach 10 minutes of this exercise).
mountain climbers: raise the heart rate while building strength and endurance in the core. No special skills are needed.
Explanation:
