I like Crossfit -- but I don't really play sports. If your playing high intensity sports as is multiple times a week, Crossfit is a bit much.
Joe Rogan - How To Workout Smarter
https://www.youtube.com/watch?v=_fbCcWyYthQ
While most agree "never wake up sore" might be a bit of an overshoot. I think in general this mentality works. Crossfit is good if its your sport...but I don't think its going to make you a better football player in the long run.
Meanwhile, some extra low intensity strength and cardio work is pretty typical for Crossfiters.