PM Gordon Brown, with his wife, appeared less than relaxed for a summer holiday recently. Increasing his exercise - reportedly with the help of a personal trainer - could help release some of the tension.
Such formality was contrasted with his opponent's relaxed outing on a Cornish beach with his wife. Tory leader David Cameron showed off his toned legs - a benefit of regular cycling to Westminster.
But back on the job, suit-clad leaders do get some chance to display their fitness. Former PM Tony Blair didn't even unbutton his jacket to return his shot, while Mr Brown powered into his serve.
Other leaders dress more appropriately, as French President Nicolas Sarkozy opts for a tight T-shirt and obligatory music player - plus some bodyguards - to keep up his fitness levels.
US President George W Bush frequently cycles at his Texas ranch. But he has occasionally taken a tumble - including knocking a policeman to the ground at a summit while waving.
One of his predecessors has similarly taken a fall. Jimmy Carter was photographed tripping on a jog - something Mr Brown would do well to avoid on his sprints round Suffolk.
US presidential hopeful Barack Obama has been described as 'too thin to win' by one columnist. Could the same be said of Labour's David Miliband, who contributed to leadership speculation recently?