Mark Vella Author Mark Vella has been involved in the field of health and fitness for more than 15 years as a personal training instructor, lifestyle counselor, massage therapist, and practicing naturopath. He lectures to fitness professionals on a variety of ealth science topics. He has been active in developing standards and manuals for fitness trainers in his native South Africa. He is also the author of Anatomy and Strength Training for Women.

Consultant Dr. Nick Walters, an exercise physiologist with more than 20 years' experience, is the vice principal and head of research at the British College of Osteopathic Medicine in London.
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