In my trial game for Leicester City FC in 1969 I was - ahem - too busy hitting the back of the net twice in our 4-2 victory over the other triallist team to bother writhing around like a nancy-boy..

Ground-writhers might have deep-seated pychological weaknesses, maybe it's a cry for help, or a mini-nervous breakdown, or maybe a homosexual perversion manifesting a desire to obtain sexual pleasure from writhing in agony in front of a zillion TV viewers..
Speaking of homos, many American Football players no doubt get erotic pleasure from being decked out in all that armour plating and roughly manhandling each other, many even effeminately take the field wearing makeup..