The ricochet jump is used to build strength in the lower leg muscles and tendons. You can basically think of this as a more intense calf raise. Use this exercise to increase the explosiveness provided by the final push of your toes off the ground as you take off.
To begin ricochet jumps, find a low step or block that is somewhere around 6 to 12 inches high. Be sure that this object is stable or else you could fall and twist your ankle. Once you have your step/block in place, all you need to do is jump up onto and off of it in a rhythmic fashion. You should only be using your calves to push your body up onto the step when you do ricochet jumps. If you need to use your knees a lot, the step is probably too high. Switch to a smaller one and work your way back up. Remember, quality over quantity.
Ricochet Jumps Video