[tank]

i have no clue about your goals or your body, but here's a generic list of things you could do:

pushups 5 sets to failure

air squats (squats with no weight) 5 sets to failure

crunches 5 sets to failure

pullups/chin ups 5 sets to failure (if you have access to a bar)


you can superset any or all of these for added aerobic effect.