Barack Obama pumps iron at the gym with the best of them, despite his busy schedule.
Video has been leaked of the 52-year-old US president working out at a hotel gym in Poland.
US security experts were trying to find out how the unauthorised snaps, and a video, of the presidential work out were taken, the Daily Mail reported.
Obama appeared to be in gym at the five-star Marriott hotel, taking time out from his busy schedule.
Candid photos of Obama are generally hard to come by as his aides often block independent cameramen from photographing him, before distributing flattering images shot by Pete Souza, his official photographer.
In the leaked images, Obama is shown wearing a dark blue tracksuit over a white T-shirt as he exercised for about half an hour.
Obama then retired to his luxury NZ$1800 per night presidential suite on the top floor of the 40-storey tower. Pictures of the session were later published in a Polish tabloid.
Local photographer Marek Kwiatkowski said the pictures must have been taken from a hidden camera.
Obama met the new Ukrainian president Petro Poroshenko yesterday, and later attended celebrations to mark the 1989 anniversary celebrations of Poland's first free elections. He then flew to Brussels.