My PE teacher set up a giant course with about 30 stations where you did pushups/sittups/stairs/zigzagin/crunches/arches ect. You got in a pair and had to do the entire course running as many times as you could in 1 1/2 hours, this was all boys and the entire time sitting on the sidelines were all the girls who were/meant to be sitting on metal balls.
Thats all.
None of them even did it for more that 10 seconds and just talked.
Eventually 2 of them came to me and my partner because they wanted to try it and nearly passed out at the second station.