school sport  is back   says pm tony blair has promised that  sport is back  as a priority for schools.  the prime minister launched a £500m initiative to allow school sports clubs in england to provide up to three hours of extra activity a week by 2010.  it s an important part of education and it s an important part of health   mr blair said. but the conservatives say government proposals - which include two hours  pe within school for 75% of pupils by 2006 - are unrealistic.  the latest move is aimed at encouraging more diversity in sport  with activities such as yoga and tai chi being options. launching the initiative  mr blair completed an agility course and shot basketball hoops with students from the all-girl waverley sports college in southwark  south london. he said:  you ve got to bring back school sport. it s got to be done differently than it was 30 or 40 years ago. it s still very  very important.   earlier  education secretary charles clarke told bbc news there were at least three areas which needed  a coherent framework  and  dedicated funding . these were training for pe teachers  establishing more specialist schools and the development of partnerships for activities such as inter-school competitions. he added the government had originally pledged  for every pupil to get at least two hours of high-quality physical education  a week. the proportion was currently at 62%  and the government was hoping this would rise to 85% by 2008 and 100% by 2010. the money for the initiative will come from a new £500m fund.  the £500m move will also increase the number of specialist sport colleges from 350 to 400. but the conservatives warned of rising obesity levels and said that since only a third of children do two hours of sport a week currently  the government is promising something it cannot guarantee. shadow spokesman for sport hugh robertson said:  i suspect the correct way to tackle it is to look at the other end of the spectrum and try to enable the clubs - which is where the real passion for sport exists - to deliver the school sport offer.  he said more emphasis should be put on traditional sports  saying that an  anti-competitive sport agenda  had been pursued in recent years. martin ward  of the secondary heads association  said members did not like  ring-fenced funds  and that it should be up to the schools themselves to decide how to spend their money.