Many people quit sports, when growing old.

Remaining active in old age is essential for one’s health.

Regular physical activity has many positive sides and there is a way of keeping it after retirement. 

My publications are available on http://www.AbeBooks.com, http://www.payot.ch and other Bookstores and Libraries.

Digital versions can be purchased at http://www.barnesandnoble.com and http://www.fnac.com.