It is a sorry rule. Have heard lots of coaches talk about being allowed to work your tails off for 2+hours per day, 5 days perweek in practice, yet you can't wrestle 5 matches in a day with breaks between. Unbelievable.
I always think of this as an insult to the kid that makes an unfortunate mistake in a match, claws his way through the backside and has to forfeit the match that he earned so hard to achieve.
