Two-time Olympic women's shot put champion Valerie Adams of New Zealand has announced her retirement at the age of 37.

Adams also won Olympic silver and bronze medals and was a four-time world champion, a four-time world indoor champion and three-time Commonwealth Games champion.

One of 18 children of a Tonga-born mother and England-born father, Adams is a sister of the Memphis Grizzlies basketball star Stephen Adams. Her sister, Lisa Adams, was a shot put gold medalist at the Tokyo Paralympics last year.

She announced her retirement at a news conference on Tuesday.

"I'm here to share with you all that I'm officially hanging up these size 14 throwing shoes," Adams said. "After winning my bronze medal in Tokyo, I contemplated whether to embark on another campaign."

Adams won first Olympic gold medal at Beijing in 2008. She retained her Olympic title at London 2012, was second at Rio de Janeiro in 2016, and third in Tokyo last year when her friend and longtime rival Gong Lijiao of China won gold.