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Australian 10000m record holder Ben St Lawrence has finished second in a fun run - wearing a gorilla suit.

Competing in the Ryde Rollercoaster Run, St Lawrence finished just over half a minute behind NSW 10000m champion David Byrne in a time of 11:14 over the hilly 3.2km course that traversed three steep local hills.

The inaugural Ryde Rollercoaster Run, organised by Communities 4 Communities with Gladesville's Giant Steps as the beneficiary, drew 152 starters onto the course, dampened by light rain that brought welcome relief to firefighters.

The first woman home was Sydney-based Victorian, Victoria Mitchell, in a time of 11:41.