Crossfit 50s

All I can say is right now my core is super sore and feeling beat up good. Normally what makes me go thru this pain is when I do Super Crunches in Tabada. Today's workout for Crossfit started with a 1.5 mile run as a warm up. After that here is the WOD:

1) pull ups
2) kettle bell swings
3) air push-ups
4) ball cleans 
5) knees to chest on bar

Each workout done at 50 reps each. Normally when I'm told to do knees to chest, I do toes to bar instead, but due to that being the last one. I stayed with knees to chest - this is the one that definitely killed my core. Tomorrow is going to be a really sore day.