After touching down in Rio de Janeiro just after midnight, Michael Phelps took his first leisurely laps in the main competition pool at the Olympic Aquatics Centre.
Team USA arrived for their first look at the Rio 2016 swimming venue and toured the deck in sneakers and shorts before changing into their practice suits. They held a poolside team huddle and cheer.
At the nearby warm-up pool, the team hung a USA flag on the wall amongst other flags, including Germany, Great Britain, Canada and China, as delegations carved out a little territory at the busy practice pool.
Wearing a starred-and-striped swimsuit, the nine-time Olympic champion reached for a Powerade before leaving the warm-up pool for the lanes at the main competition venue.
For the afternoon's training, the USA first set up in lane 5 before spilling over to lane 3 where Phelps joined them. He dived in the water at 2:20pm and began with a long underwater pull before popping up in freestyle. He swam for 50 minutes before taking a practice start and climbing out of the pool.
Phelps will look to defend his individual Olympic titles in the men's 100m and 200m butterfly and the 200m individual medley. He will also race the men's 4x100m freestyle relay.