Many of my clients are sports enthusiasts. I have waxed and manscaped soccer players, cyclists, runners, swimmers and body builders. Some of the fitness clothing such as tight cycle shorts will break hair and cause ingrowns, therefore these individuals would rather remove it by the root. Hair can create a drag and if you are competing, seconds count.
Manscaping for looks or for a companion:
A little vanity doesn’t hurt, although I hear this reasoning the least. Some fellas decide to get waxed or manscaping because they are leveling the playing field so to speak. Their partners do it, so they feel they should as well. Men like the way a nice groomed body looks. There is the notorious “optical inch” too (the saying goes “If you wax an inch you gain an inch”). Romantically speaking, less hair creates more sensitivity.