Quadriceps
Abductors, Adductors, Calves, Glutes, Hamstrings
Place lower box (12-16") and higher box (22-26") few feet apart.
Stand on lower box edge.
Drop off box, landing softly on ground.
Immediately rebound, jumping explosively up and forward onto higher box.
Use arms and full body extension.
Land softly on higher box.
Step down. Repeat.