Re: Cool Down?
If you need to increase flexibility, which most people new to Crossfit need to work on in order to perform the movements with proper form then definitely take the time to stretch after your workouts. No better time to increase flexibility of your lower back, shoulders, hips, hamstrings than after a workout while your muscles are still warm. PNF (Proprioceptive Neuromuscular Facilitation) stretching helped me with my hip and hamstring flexibility issues that limited my range of motion in any type of squat.
You can find information about PNF stretches on the web. But, the basic idea behind them is to stretch a muscle as far as you can without pain, hold for a few seconds. Relax the stretch of the muscle(s) for a few seconds. Then reapply the stretch and this time contract the muscle(s) being stretched to resist the force being used to stretch the muscle(s). Hold for 10-15 seconds. Release the tension on the muscles for a few seconds. Then, resume a deep stretch of the muscle(s). Again, without pain. You should notice that your range has increased noticeably. Rest and repeat 2 to 4 times.
Ideally, with Crossfit workouts the last thing you should feel like doing after a workout is more physical work.