Lack of Men in Fitness

I have been browsing DVDs on Amazon as well as in the Columbia House club, looking at various categories. One of the categories I decided to browse was fitness. I notice something quite disturbing to me when looking at them, most of the covers featured women. Why are there no men in fitness? The only exceptions I found were Billy Blanks (he’s aging), Richard Simmons (hardly a man) and Jake (he’s aging too).

Even searching for military workout DVDs on Amazon returned a majority of women on the results. What gives?

Can men not properly instruct workouts?