8. Gregg EW, Cauley JA, Stone K, Thompson TJ, Bauer DC, Cummings SR, Ensrud KE. Relationship of changes in physical activity and mortality among older women. J Am Med Assoc 2003: 289 (18): 2379-86. myDr myDr provides comprehensive Australian health and medical information, images and tools covering symptoms, diseases, tests, medicines and treatments, and nutrition and fitness.
A brilliant book at all levels, Walking for Fitness is written by Nina Barough who started the Walk the Walk charity and is a power-walking guru. It covers absolutely everything, with sections on how to get started, basic walking technique, stretches and complimentary exercises, good walking shoes and clothing, cross training, food intake, related injuries, walking with children, walking while pregnant, walking for charities or in competitions and training programmes.

Aerobic exercise is indicated for patients who lack the ability to sustain activity for a desired period of time because of decreased cardiovascular efficiency. Oftentimes, these patients have complaints of fatigue with a given level of exercise. Aerobic exercise increases the body’s capacity to absorb, deliver, and utilize oxygen. However, there are some limitations to being able to use aerobic conditioning for older adults. Joint pain and/or muscle weakness may preclude a patient from being able to perform the multiple contractions needed to provide a cardiovascular stimulus. In those cases, strengthening exercises may be needed prior to attempting aerobic exercise. For example, when an individual who is not on β-blockers walks 200 m on the 6MWT, but the heart rate only increases 10 beats per minute (bpm), the assumption can be made that the individual was not able to exert enough effort to increase heart rate and that a lack of muscle strength may exist.30

The more I walked, the more thoroughly immersed I became in its how miraculous it was. It calmed me down. I could start my daily tramp in a foul mood: riled by my partner, anxious about a meeting or wrong-footed by a nightmare; sad or scared or emotionally a little lost. By the time I arrived at wherever I was supposed to be: I was fine. Something about walking gives you perspective.