I have an extremely bad shoulder injury..  I cannot workout ok except boring cardio, ie, bike.  Hard to get motivated.  I can workout my legs, but I really need to take advantage and lose a good amount of weight.  I have put on 18 pounds since July, all muscle is shifting. 
 
What can I do for leg workouts - A muscle a day or Do I need to break it down into 1-2 days..  Thanks ahead of time..
 
 

First things first. 
If you are gaining weight, that is DIET, your diet is not right.
 
Next:
Your upper torso trainnig will be dictated by your physician.
 
Now then:
Lower body, you can train quads/hams/calf/glutes
You can likely also train abs and lower back.
You can train the muscles each 2-3 nonconsecutive days/times a week, depending on the severity of the training.
 
Last:
For cardio..go into the losing fat link in my sig and find the link to HIIT cardio.
 
Good luck!
 

Thanks, My diet is getting there.  I have some adjusting to do..  I do good for a couple of days and then I splurge, so I am adjusting here and there to get over the splurging. 
 
I will try to increase the cardio - and hit the HIIT.  I will hopefully be able to run soon and get back into it. 
 
Thanks for everything you give to DBB.com