Mackie Shilstone is no newcomer to the fitness field. With a degree in sports nutrition, Shilstone has worked with an impressive group of professional athletes, including world heavyweight boxing champion Michael Spinks. Intensely athletic, Shilstone has a long list of his own achievements, including once being named the most physically fit male at the National Fitness Classic Competition. The president of Mackie Shilstone and Associates, Inc., Shilstone still remains a much sought-after trainer and speaker.