I have a question. The DR says that exercise is a key factor. I can use some advice here. I a lot of health issues. I have emphysema, bad knees, arthritis in the spine and hands. I am saying this because I think I can do dumbbells or stretch bands while sitting. Would there be anyone in the group that can recommend what exercises can be done with dumbbells or stretch bands while sitting? Thank you so much for you advise and help in this matter