Ferrari\'s Fernando Alonso has said he feels in the best shape of his career as he prepares to defend his Formula One world championship lead at the German Grand Prix on Sunday. \"In Formula 1 you are probably a better driver every year because you improve and you constantly learn from mistakes so I\'m sure next year will be better,\" the Spaniard, who won the 2005 and 2006 titles with Renault, told a news conference. \"But it\'s true that this championship has been good for us so far. \"I remember a mistake in (the) Q2 (qualifying session) in Australia where I touched the grass on turn 1 and I spun. \"But apart from that mistake I probably wouldn\'t change too many things about what I\'ve done so far. \"This is good news because there are always mistakes here and there so I\'m quite pleased with my performance. \"Physically it\'s my best year so far. In previous years I\'ve had to race with pain, whether it\'s in my leg or my shoulder, but so far this year it has been 100% in every race. Hopefully it will stay like this. \"Obviously a driver\'s life is not normal as we don\'t go to an office for eight hours so we wake up and have four or five hours of training. \"That\'s something I enjoy but yes, so far I\'ve been in the best condition of my career\". Alonso leads the F1 drivers\' standings with 129 points, 13 more than Red Bull\'s Mark Webber in second.