Do each for time or reps.
1.) Bosu Squats with weight. Try 10-20 reps.
2.) Bosu Runners. Try 50 side to side or 30 seconds non-stop.
3.) Busu Squat jumps. Be sure to tuck those knees and land in a squat each time to protect your knee. Try 10-20 reps or 30 seconds.
Enjoy leg day!