Michael Phelps Teases The World With His Poolside Instagram

So, IS he coming back?
Michael Phelps declared his retirement to the world, but his Instagram picture (above) on Monday hints otherwise.
The Olympic swimmer tweeted the pic of him getting instructions on the starting block, saying:

One on one trainingsession with coach_bowman !!! instagram.com/p/aY9udkyx9R/

— Michael Phelps (@MichaelPhelps) June 10, 2013

Hmm… That looks a lot like some real training is going on there.
However, he also posted some from a Speedo shoot he was doing (below), so maybe this was just more of the same?
Or he could just be training to keep that bod in shape in case a tough guy at the pool challenges him to a race! LOLz!
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[Image via Twitter.]