Try this with a partner

Daily Dose

10 sets
Maximum number pushups + 50 squats

Rules;
Face to dirt on push ups, back braced not slouched
Squat until the thighs are slightly below parallel to the floor.

Benefits:
Improved Strength
Greater muscular endurance
Improved aerobic capacity and lactate system (training body to work out at high intensity and recover).
Time efficient
Zero Cost