I would add that anyone, athlete or gym patron, needs to learn how to land and stabilze before any type of plyo work is begun. Skipping this step increases the chance of injury. Especially young female athletes. It would be very wise to search for proper landing drills and jump drills to avoid leg/knee injury in athletes before starting a plyo program.
In season – Hang cleans, they get enough repetitive stress in practice and games.
off season – jump drills
of course this is after a solid foundation of body position awareness, increased strength levels, and solid deceleration ability.
Jumpers knee is too common for me to add any kind of Jump drills in season…with the exception of maybe box jumps with now jump down.