Xue Sheng
All weight is underside
Those teenager will kill with all the running they do. You are right Jump n jack could have been done.
One of the best and most enjoyable workouts I ever had was from my first CMA Sifu. He loved Soccer so we played indoor soccer for warm-up. You want a brutal game of soccer just make up your 2 teams of martial artist and dont pay much attention to rules :EG:
At one of his school picnics, actually his first and last that I ever attended, we played soccer on an outdoor field, that was a blast and a great workout, again being martial artists, kicks, strikes, blocks takedowns and shoulder rolls were all allowed. I think the only rule we really adhered to was not being allowed to touch the ball with our hands.