Then they try 2 and 2, 3 and 3, 4 and 4, until they are doing all breaststroke swimming after the pullout.

然后练习2次、3次、4次，直到他们可以在出发后所有的动作都做蛙泳动作。

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From left to right, Australias Samantha Marshall, Leisel Jones and Sarah Katsoulis compete in the womens 100m breaststroke swimming final during the Commonwealth Games in New Delhi October 8, 2010.

从左至右，澳大利亚的萨曼莎·马歇尔，Leisel琼斯和萨拉katsoul is竞争在女子100米蛙泳期间在新德里2010年10月8日英联邦运动会决赛。

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The leg action of the breaststroke may have originated by imitating the swimming action of frogs.

蛙泳的腿部动作可能是模仿青蛙的游泳动作而来。

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Thursday's success for Scottish Olympians followed Lossiemouth rower Heather Stanning winning gold alongside Helen Glover in the women's pairs on Wednesday, the same day as Glasgow-born Michael Jamieson won silver in swimming's 200m breaststroke final.

BBC: Golden success for Olympic Scots

Japan meanwhile were celebrating after landing their first Olympic swimming title for 12 years when double world champion Kosuke Kitajima won the men's 100m breaststroke.

CNN: Thai gold as Asian athletes excel