Kipping is using momentum to get more work done. In CrossFit, power is king. Power is defined as intensity, and intensity is the time rate of doing work. The greater your work capacity, the fitter and therefore the healthier you are. Optimal health is work capacity. To the extent that you are capable of doing x amount of work in x amount of time, that defines your health. Makes sense to me!
So kipping is a means of getting more work done. It requires coordination, strength, power, and stamina. Kipping is not "cheating" unless you call doing more work "cheating." Search you tube for some excellent videos on the subject.
For those not planning to attend on Saturday:
50 wall ball
For those who DO plan to attend on Saturday:
Deadlift 3 3 3
3 x 2 min combo plank (prone, side)
Post: Stretch, foam, roll, mobility work (don't skip this!)