Pick your hobbies around their activity level. Rather than sitting around and watching television for entertainment, get an audiobook from the library and take a long walk. Stretch out your new leanness in a yoga class. Learn to build things, or get started on some of those DIY home improvement projects you've been meaning to do. Even something as simple as taking the stairs at work or parking far away from the entrance in the store parking lot adds small bits of physical activity to your daily life that add up over the course of the week.
Just 10 extra pounds add 40 pounds of pressure on your knees and other lower body joints. That can wear them out quicker. Extra fat can also cause inflammation -- when chemicals in your body damage your own tissues over time, including your joints. Losing even a little weight can ease these effects. If you keep it off, you’re much less likely to get arthritis later in life.