Swap exercises with guided rehab exercises for injured body parts

I figured the injury rehab option would accomplish this. Looking for thoughts on this idea for injury rehab mode instead.  

This mode would take the body part reported as injured (could add granularity here, i.e., posterior deltoid, traps, etc. instead of shoulder and chest respectively). In the next workout, the app would provide the prompt to substitute with a rehab exercise. 

This effort might be a 3 part effort:

- add rehab exercises

- add prompt to substitute exercises for body parts reported as injured

- add an additional prompt to specify specific area of the body part as mentioned earlier (e.g. posterior deltoid)