Re: CrossFitters vs Decathletes
Double unders: relatively easy and some people you wouldn't think can bang out gagillions of these
thrusters: not terribly difficult if you can front squat and push press
muscle-ups: not terribly difficult for those with base strength. false grip is very challenging
kipping pull-ups: not hard
high rep bodyweight stuff: ...
high rep box jumps: ...
wall ball: not really hard
deadlifts: only difficult when weight gets heavy
C&K: some time is required and technique to get over 250lbs as far as CF goes
As well, Annie T was a gymnast before a polevaulter apparently. And no, girl's don't really work ring muscle-ups ever. Sometimes, bar muscle-ups. On rare occasion.