Some experts believe that burpee (立卧撑) is the best exercise in the world because this exercise is one that anyone can do very easily and extremely cheaply.
How to perform the basic burpee correctly:
A. 
B. 
C. 
D. 
Keep your back straight, squat (下蹲) down and place your hands on the floor.
Begin in a standing position with your back straight and your arms at your sides.
Bring your feet back to the squat position by placing your hands on the floor. Then jump straight up as high as you can after the squat position, holding your arms up directly over your head.
Move your feet back behind you, so that you move from a squat position to a full-length leg extension. Keep both arms and legs straight and strong.
As a form of exercise, the burpee is .
A. difficult and boring
B. useful but difficult
C. simple and inexpensive
D. simple but expensive
