Reading is a great thing to do when you are isolated by yourself. Try a variety of topics from entertaining to educational. Meditation and stretching are great for your body but also for you mind. We spend so much time sitting at desks or in chairs that put us in strange unnatural positions. The best way to combat that is to stretch your muscles so that as you get older you will stay limber and help prevent a lot of common problems in modern humans. Mediation helps your brain stay relaxed and calm when situations in previous times could cause you to overreact or act impulsively.