have him do circuits of 5-10 exercises, for 30 secs/min a piece, no rest in betweeen..... or for number of reps (like 20) with no rest in between exercises, till he gets to the last one. then rest a minute or 2, then repeat..... things like burpees, pushups, mountain climbers, side plank dips, plank-to-pushups, jumping jacks, handstand pushups (against a wall), situps, plyo metric squats, plyometric lunges, wall sits...... tons and tons of stuff
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