The story is I have a muscular disease the wreaked havoc on my core and trunk muscles. As a result, other muscles are over developed and "take over" for those muscles. For example, but forearms and wrist hurt way before I can get any burning or anything in my chest or upper arms. My calves & ankles hurt before anything else. Is there a way I can work my core muscles, shoulders, chest, back and gluts without putting strain on those the distal muscles? Also, all the muscles (chest back core) are very weak, so I can't really do certain exercises.