The almighty kipping pullup.  A staple in CrossFit since the very beginning.  Many athletes ask to be taught how to kip because yes, it is a faster pullup than strict respectively.  However, it is a rule of CFG and it should be at other gyms as well, that an athlete should be able to perform 5 deadhang pullups before learning how to kip.  Why?  The ability to perform 5 strict pullups shows a base of strength in the athlete’s shoulder and back muscles and also shows integrity in the shoulder and elbow joints.  Kipping without that base of strength and joint integrity can lead to injury.  Your body is not prepared for that type of momentum and force on that joint if there is not strength to back it up.  My advice is to work on those strict pullups 2-3x per week before or after class.  Perform 10-15 reps with or without a band in as many small strength sets (2-3 reps per set) as possible.  Get those 5 reps in a row and then you can kip your way to faster pullups.