When the Police split up 23 years ago, they were the world's biggest band... and possibly its most competitive. As they embark on a £100 million reunion tour, Chris Salewicz looks in on their rehearsals at Sting's Tuscan villa, and finds they've swapped punch-ups for pilates. OK, everybody: pilates on the lawn at 8am tomorrow,' Sting says as he heads up the stone steps of his 20-room Tuscan mansion to bed. It's 11pm. Limping slightly, drummer Stewart Copeland, who at 54 is a year younger than Sting, and guitarist Andy Summers, sipping from a mug of camomile tea, follow soon afterwards...