about a month ago i was on my bike and got hit by a car. i injured my left hamstring and im in therapy for it im walking and doing 50lb leg press 30 reps. i used to bike and run alot. my right leg is my dominant its uninjured. im still recovering from a severe concussion. i was stuck on a couch for about a month and now im jsut starting to move around again. i have the iron gym at my disposal. what can i do to regain muscle and lose the extra fat i packed on without risking my leg or concussion getting worse.