Funny, I lost an arm contest to my friend (a girl), and how realized how out of shape I had gotten...so I started working out again, then beat her, and all was right with the world, ha ha.
In fact, it's a good measurement for any guy: if a normal or relatively fit girl can beat you in a sport activity, you need to work out more just to be at the baseline of an average guy.
If you want to beat other guys, then obviously you need to work out even harder, but that's next level stuff, and chances are slim you ever (unless you become one) beat a body builder.