"One of the most incredible feelings ever sat in the water on the start line minute before the cannon goes off," the controversial star captioned the post.
"@im.kona good luck to all the athletes taking part and a big thank you to all the supporters and helpers taking part and a big thank you to all the supporters and helpers @iamspecialized_tri @ironmantri, let the island come to you. Best wishes and race safe. Next year i'm coming back can't wait."
His followers were quick to notice his remarkable gains.
"Look how ripped his is!" Writes @rubydicken while @tomlarner commented, "Gordon's a beast"
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