| title | ISBN-13 | year of publication |
|---|---|---|
| Healthy Hips Handbook: Exercises for Treating and Preventing Common Hip Joint Injuries | 978-1-56975-819-9 | 2010 |
| Healthy Shoulder Handbook: 100 Exercises for Treating and Preventing Frozen Shoulder, Rotator Cuff and other Common Injuries | 978-1-56975-738-3 | 2010 |
| Stretching for 50+: A Customized Program for Increasing Flexibility, Avoiding Injury, and Enjoying an Active Lifestyle | 978-1-56975-445-0 | 2005 |
| Weights for 50+: Building Strength, Staying Healthy and Enjoying an Active Lifestyle | 978-1-56975-511-2 | 2005 |
D.K · Dr. K. · Dr. Karl Knopf M.D. · K.k. · Karl Knopf