Jumping is a skill. Don't do it like this.

Jumping is a skill. Look at his right knee, i wouldnt want to be his knee. The knee is a sagittal hinge, not a lateral hinge. This is going to likely lead to a Valgus Thrust degenerative joint. Jumping is a sagittal plane skill first , master that first.
It just hurts to watch his right knee !

http://www.menshealth.com/…/best-core-and-cardio-workout-men