Do Tai Chi
it's the best thing for the body and mind
very distressful, no possible physical injuries
you can do it everywhere , better in the wilderness or in a park
http://cdn2-b.examiner.com/sites/default/files/styles/image_content_width/hash/fe/af/1338688917_6330_GM_Chen_Zhenglei_Grand_Cannon%201.jpg?itok=na5-c1HO
I practice the Chen style but are all fine if you find a good instructor