I am 51-years-old and I know a bit about this field as I teach physical conditioning at Simon Fraser University (have done for 25 years). I have always played and coached sports that have a high intensity anaerobic component to them (i.e. soccer, tennis, squash, and rugby). From my reading of the literature and "on-field experience" I always maintained that high intensity was the key to a successful program. I also knew that my sports provided great conditioning, but not enough on their own….I had to lift weights, I had to be stronger. But I always failed to sustain my strength training programs and only seemed to work on flexibility after my latest hamstring pull (funny how that works). I would do my three sets of 10 reps for 8-10 exercises; I would even add variety by super-setting and designing circuits. But the variety and nature of that training was not as stimulating as my beloved "sports with a ball and an opponent". I was then asked by the new director of my university department to review the CrossFit Foundations article. I was like a kid in a candy store reading that article. Here I was reading exactly what I believed to be true from my knowledge and experience. CrossFit is an incredibly creative and effective program. I thought I knew what variety was until I found CrossFit. I was mistaken. One of my favourite quotes from the CrossFit philosophy is "strive to blur distinctions between "cardio" and strength training. Nature has no regard for this distinction." If you're studying in this box (Crossfit Vancouver) you're in the right place. Tony Leyland Senior Lecturer School of Kinesiology Simon Fraser University email@example.com.