4. Warm up for every workout
This seems to be a no brainer, but in reality every competitor is warming up for event one only. I barley see any Crossfit athletes in the warm up area after event 2 and 3.
Warm up should stay in the sub 20 minutes time frame. There is no need to warm up for a whole hour, especially when four events are coming that same day. I personally have a 3-time 5 minutes rule. Five mins of a general warm up (row/run), 5 minutes of specific (movement prep for the particular Crossfit workout) and 5 minutes WOD flow prep where I test upcoming movements.