Tom's school friend, Stan, could dive into the water, just like that, effortlessly. Tom decided he would like to be able to dive, too. So, he gave it a go.
He climbed up the tower, walked out on the plank and threw his body, straightened out, into the pool. The result was, when he hit the surface of the water, a very bad pain in the stomach.
"You've only done a belly-squasher!" called out Stan from the side of the baths.
"Only, you say," said Tom. "That really hurt and winded me."
"You should have gone head down first."
"Well, why didn't you tell me?" said Tom, plaintively.