Scissors Jump

How to do it

Assume a lunge stance position with one foot forward with the knee bent, and the rear knee nearly touching the ground.
Ensure that the front knee is over the midline of the foot. Extending through both legs, jump as high as possible, swinging your arms to gain lift.
As you jump as high as you can, switch the position of your legs, moving your front leg to the back and the rear leg to the front.
As you land, absorb the impact through the legs by adopting the lunge position, and repeat.

What muscles does the Scissors Jump work?: Mainly the quads, with help from the glutes, hamstrings.
What equipment do I need?: Nothing but your bodyweight.
Is it good for beginners?: Yes, it is rated beginner level.
How do I track progress on it?: Log each set and beat the weight or reps from last time. Liftrung shows your last set beside the next one and estimates your one-rep max from your sets.

Exercise descriptions: free-exercise-db, public domain.