US First Lady Michelle Obama has given her own personal good luck message to Team USA ahead of Friday's opening ceremony for the Olympics.
Mrs Obama urged America's athletes to "have fun, breathe a bit, but also win", as she met them at their training base in east London. The First Lady is leading the US presidential delegation which includes a ringside seat at the ceremony.
She began her trip to the capital with a visit to the University of East London, Team USA's home during the Games, and will also take part in a Let's Move! event, as well as joining a reception at Buckingham Palace. Mrs Obama, sporting a red top and red and white jacket, wished her Olympians good luck at a breakfast event.
She said: "Wow, I'm going to be saying that a lot over the next few days. Wow, wow! I can't believe I am here, I am beyond proud. Thank you so much, it's a pleasure and a joy and an honour for me to be here with all of you. I can't begin to tell you how amazing it is for me to be leading the delegation."
She urged the Olympians to "try and have some fun".
"You guys look pretty focused and you should be. You all take advantage of everything - stop, look around you. In my position sometimes I don't get a chance to breathe, take it in. Try to have fun, breathe a bit, but also win."
After her speech, Mrs Obama met the athletes, posing for photographs, before leaving for the Let's Move! sporting event at the US Ambassador's residence in central London for about 1,000 US military children plus US and British students. The initiative, created by the First Lady, aims to combat childhood obesity within a generation.
And Mrs Obama said Olympic athletes were part of inspiring that generation.
"You just never know who you are going to inspire, you just never know. You are certainly inspiring me every day. I still have those same feelings of pride, excitement and wonder, so being here is other-worldly for me.
"I am still so inspired by all of you. We are all proud of you all, we really are. You have got a country back home who is rooting for you every single second, so you have already won."