Knees to feet jumps are a mainstay of our program, the variations you can add are also important to advance on just the basic version, we have a few that our players are using:
knees to feet vertical up onto a gym flooring square, I have one player at Sanyo who does this onto a 20 centimetre box, quite amazing
done with DB’s in the hands
done for distance like a standing long jump but starting on your knees
performing a snatch or a clean with a bar of DB’s
all offer a progression, cheers, ash