sports in America.

According to years worth of data from NFHS that appeared to be more Soccer, Lacrosse and Wrestling at least for girls between 1990 and 2009. I believe boys were similar in those sports as well but I trimmed the chart below down to females only for some marketing I was doing at the time. Sure things can change in 7 years but one thing that is certain is women's wrestling is continuing to grow at a rapid pace...



There are many ways to stake a claim to "growth" so the chart measured 3 ways total raw number increase, percent increase and years of growth and then an average of their rankings.

Note that Swimming & Diving for this period had an overall rank of 10th for women and their best category they ranked #7 for total raw number increase. If 10th on the list fits your definition of "one of the fastest growing" then you would be right.