Any exercises I can do while from the waist up?

recently I can't walk properly because I had an accident, so I was wondering while I heal what type of exercise can I do from the waist up that will help me not put on more fat, sit ups can't be done because of my leg.

any help will be greatful
Updates
+1 y
thanks for the advice everyone :-)

Any exercises I can do while from the waist up?
Post Opinion