How to Do It
Left arm overhead press: 2 reps
Right arm overhead press: 2 reps
Left arm overhead press: 3 reps
Right arm overhead press: 3 reps
Left arm overhead press: 5 reps
Right arm overhead press: 5 reps
If you still have gas in the tank, do a set of 10 reps on the left and then repeat on the right. You'll complete a total of 40 reps if you manage to get through the additional sets of 10. However, it won't "feel" like 40. That's because you're constantly changing reps, and switching sides throughout.
(If you're looking for more ways to burn fat and work every muscle, check out The Anarchy Workout. One guy lost 18 pounds of fat in just 6 weeks.)
I suggest most people do the entire workout with only one weight. Let the volume be your limiting factor, not your technique under a heavy load.
If you do want to go up in weight, I suggest you do this: Perform a 2-3-5 ladder on each side like outlined above. But do up to three rounds of the ladder, increasing your load each time. Skip the sets of 10 while doing this variation since your goal is to use the biggest bell or load you can in the last round.
More: Beach Body Workouts for Men
Stay in shape in a fitness class or read more fitness articles.