Jenson Button warmed up for a potentially difficult British Grand Prix weekend by posting a new best time in his other favourite sporting discipline.

The Briton, who is due to at Silverstone today [Tuesday] to promote the next round of the F1 world championship on home soil, took time out from his motorsport duties to compete at the Berlin Ironman event at the weekend, lowering his personal best for the 'half ironman' distance by a full ten minutes.

The competition - which comprises a 1.9km swim, 90km cycle and 21.1km run - tested Button's renowned fitness in the midst of a busy F1 schedule, but the McLaren driver responded by posting a new mark of four hours and 19 minutes around the German course.

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Button has long used the triathlon discipline as a training tool, and hosts an annual event at Luton Hoo to raise funds for charity, but took advantage of the three-week break between Canadian and British grands prix to compete in Berlin, where his performance will no doubt have raised spirits in the midst of a trying F1 campaign, where his hopes of a second world championship have taken a dive courtesy of an uncompetitive McLaren.

The 2009 champion has already warned fans not to expect him to be running at the front of the field at Silverstone, despite McLaren continuing to throw development ideas at the MP4-28.