working around a broken leg possible?

What do you think about training while having a broken leg
I had a motorcycle accident and I had to ditch in the process I broke my fibula
I have a cast and I use crutches. My doctor says I can still go to the gym as long as I don’t aggravate the area
obviously I’m assuming it would be dumb to just train my left leg but what do you think about training the upper body has anyone experienced this and what advice can you give me