Humans lose up to 30 percent of muscle mass by age 70, and without some work, it goes even further downhill from there. An expert in movement therapy, author D. Cristine Caivano offers a thorough and well-illustrated guide that makes strength training seem (gasp!) fun. Strength Training Over 50 is suitable for men and women, those who are already physically fit as well as those who are out of shape, injured or just plain not motivated. The book is divided into lower- and upper-body exercises some incorporating light weights or an exercise ball and offers concise, detailed instructions for each sequence. Added bonus: the models used in the how-to photos are over 50 themselves and look quite fabulous, providing just the motivation to get started.