I sitll like
#34 and
#36 the best. If you could keep in mind that this logo will be on t-shirts and other apparel and maybe make the stroke lines of the figures thicker. The runner could look a little more thicker muscle wise and have his form look more like the barbell guy. If you could keep it to two colors would be great too. I like the orange. It is cool. Don't know how hard it would be for you but could I see
#34 with Athletes and Equation stacked like
#15.
I am really liking your efforts so far. Thank you.