25 April 2014 Last updated at 08:46 GMT

Michael Phelps finishes second to Ryan Lochte on competitive return

Michael Phelps finishes second to Ryan Lochte on competitive return

Cannot play media. Sorry, this media is not available in your territory.

All-time record Olympic gold medallist Michael Phelps finishes second to Ryan Lochte on his competitive return in the 100m butterfly final at the Arena Grand Prix in Arizona.

The American says he had to "get back into shape" having gained "20 to 30 pounds" since retiring after the London Games in 2012.

Phelps refuses to confirm whether he will compete at Rio 2016, where he could add to his total of 18 Olympic gold medals.