Twin brothers Yuan Ziwen and Yuan Zihao's before and after photos have gone viral on Sina Weibo, a micro-blogging site.

Yuan Ziwen, left, and Yuan Zihao. [Photo / weibo.com/yyziwen]

The pair, who used to be chubby teenagers teased in school for their bad grades, are now seniors at Peking University, one of China's most prestigious universities, and rigorous exercise has turned them into fit, handsome young men.

Web users have lauded them for their efforts to better themselves, and even called them "the most handsome twin brothers in Peking University's history."

The Hebei natives are 21 this year, and both have scholarships for their excellent grades. Apart from attending university, Yuan Ziwen now writes books and has launched a cosmetics brand with his business partners.

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