“In the last year this controversial exercise program has attracted a growing following of thousands nationwide, who log on to CrossFit.com for a daily workout, said its founder, Greg Glassman. Participants skip StairMasters and weight machines. Instead they do high-intensity workouts that mix gymnastics, track and field skills and bodybuilding, resting very little between movements.

The emphasis is on speed and weight hoisted, not technique. And the importance placed on quantifiable results has attracted hard-charging people like hedge fund managers, former Olympians and scientists. But some exercise experts are troubled by the lack of guidance for beginners, who may dive into stressful workouts as Mr. Anderson did. (He had not worked out regularly for two years.) ‘There’s no way inexperienced people doing this are not going to hurt themselves…'” (New York Times )