Burpees

click on the image to view a video of this exercise.
Basically a burpee is a combination of two other exercises. You start with body in the same position as with a squat thrust and then, as before, keeping back as flat as possible, bring feet towards hands in a jumping motion.

Again, it is important to keep you knees between your elbows. From here, keeping back straight, jump up and on return to the ground resume the position you took off from. Finally return to the starting position with the reverse motion of the one that took your knees to between your elbows.

Level 2 This exercise can only be made harder by increasing the speed and power of the efforts, there are not additions to the technique that can sensibly be made.