U.S. swimmer Michael Phelps just tweeted: "Last workout ever....(hashtag)1day no more garbage yardage"
The 14 time Olympic gold medal winner has always said that he'll be hanging up his trunks after the 2012 Games. He also thanked his longtime coach, Bob Bowman, in the tweet before signing off, "now let's have some fun this week!!"
Phelps' first event is the 400-meter individual medley on Saturday.
—Fergus Bell — Twitter http://twitter.com/fergb
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