Robbie Williams is quitting touring.The heartthrob star has no plans to go back on the road after he's finished his 2006 world tour because he's so tired of performing.The 'Tripping' singer - who kicked off his tour in South Africa in April and will finish in Australia in December - is quoted in Britain's Daily Star newspaper as saying: "I'm not going to tour for a long time after this one."For me, this tour is a year-long celebration of what I have achieved as a solo artist. And it comes in the form of getting on stage in stadiums. After that I'll say, 'Thank you very much', it's not something that I want to do again for a long time."He added: "In some of the other shows I've done, I've been running the 1,500 metres and the 400 and the 100 metres all at the same time. It's time to relax."