Gymnasts are also usually quite small, there is actually some debate over whether gymnastics can affect growth (but I don't think there is much evidence behind this). According to this website American gold medalist Gabrielle Douglas is
four feet, eleven inches, and 90 pounds
. http://www.boston.com/sports/blogs/statsdriven/2012/08/the_bodies_of_champion_gymnast.html
Also height isn't always an advantage in soccer, just look at the average height of the Barcelona team (Messi, Xavi, Iniesta, Pedro etc).