A few years ago I popped my MCL during a Jiu-Jitsu practice and had to go to the hospital.  The doctor told me not to bend my knee past 90 degrees and prescribed physical therapy.  Physical therapy consisted of lying on my back while a nice lady bent my knee far past 90 degrees over and over.  After about ten minutes of that I would ride on a stationary bike for about ten minutes, again bending my knee far past 90 degrees.

So was the doctor a fool or was the therapist a sadist?  I guess the recollection of all of those agonizing knee bends is making me uncharitable.  The truth is, the doctor and therapist have very conflicting goals.  The doctor is all about avoiding trauma.  The therapist is all about getting you moving again.

Knee replacements can't stop her!

As a CrossFit coach you have to serve both goals.  For athletes rebounding from injury this can be tricky.  But the beauty of functional movements is that they can be scaled easily and safely.  The key-and-plate machines that you get at the big gyms cannot be scaled safely, because the loaded range-of-motion is engineered into the machine.

The picture shows Jennifer doing a scaled deadlift.  She just had knee replacements but she never misses class and is making awesome progress towards her goals.