Millions of Scouts will today renew their pledges to celebrate 100 years of the movement at events held at sunrise around the world.

They will include hundreds of young people in Glasgow who are due to take part in a mass aerobics exercise in George Square and a re-enactment of the founding camp organised by Robert Baden-Powell in Dorset in 1907.

Around 40,000 Scouts in the UK are expected to take part in sunrise events, reaffirming their promise to build a tolerant and peaceful society.

The Glasgow participants will also earn an honorary badge to mark the 100-day countdown to the decision on whether to hold the 2014 Commonwealth Games.

The event will be led by sports personalities including Commonwealth medallist Chris Ballie.

Robert Baden-Powell's experience in the Army led him to run a camp for 20 boys from different social backgrounds at Brownsea Island in Poole Harbour, Dorset, in August 1907. He went on to write his ideas in a book called Scouting For Boys and the Scouting movement was born.

The National Trust-owned island will become the focus of celebrations for around 28 million members of the Scout Association worldwide with 300 Scouts attending a commemorative camp on the same site as the one run by Baden-Powell.

Scouts from more than 160 countries, including the UK, Lebanon, Nepal, Rwanda, Serbia, Libya and Argentina, will take part in a sunrise ceremony on Brownsea at 8am, the official centenary.

Events are also being held as far afield as Ecuador and the Kingdom of Bhutan.