It is not a sport known for the fragility of its players - but boys have been banned from a prestigious British rugby tournament for being too bulky.
The ruling has led angry parents to complain that their healthy sons have started worrying about their weight and embarking on crash diets.
Organisers of the Stonyhurst Invitation 7s tournament in Lancashire have ruled that players in the under-11 category must weigh less than 50kg, or 7st 11lb.
The competition will this week attract more than 40 teams from schools across the country.
But parents at one of them, the £18,000-a-year Kirkham Grammar near Preston, were angry that their children could be excluded because of their size.