What my husband wants more than anything is to get back to work. He is a university professor who loves his research and his students. So, I think focusing on that is a great idea.
You and I are alike....I need something to occupy me while I exercise, but my husband is such a geek (in a wonderful way!) that he is content to think big thoughts while exercising. I am tempted to just throw him into the pool to force him to exercise (kidding), though I think if I were to raise the temperature of the pool he just might think about doing it. Raising the temp requires me to crawl under the house where there are spiders....big hairy spiders....but if it will get him into the pool I'd do it.
For now, until the chemo hits in a couple of days, my focus is to stop waiting on him and make him get up to get what he needs. He agrees that I have been so focused on taking care of him that I have made it too easy not to move. But, of course, in a couple of days he will be so sick again that I will need to fall back into the intrusive caregiver role.
By the way, I see that you are starting BCG treatment. Although it didn't work for my husband, it was not too hard on him. I hope it goes smoothly for you. (My husband had been exposed to TB in the past, so they think it was less effective for him than it is for most others.)