Thousands of Calgarians woke up early Sunday to take part in the 33rd annual Terry Fox Run.

Two events were held in McKenzie Town and at downtown Calgary's Eau Claire market. The Eau Claire run featured guest speaker Mark Tewsbury, an Olympic gold metal swimmer, as well as Olympic silver medal bobsledder Helen Upperton and members of the Canadian bobsleigh team.

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An undated photo of Terry Fox during his run across Canada to raise money for cancer research. ( CP PHOTO)

Participants had the option of choosing between a one, five and 10 kilometre run, walk, roller blade or bike.

The 21-year-old Fox was battling bone cancer when he began his Marathon of Hope in 1980.

He ran the equivalent of a marathon per day for 143 days, making his way across the Atlantic provinces as well as Ontario and Quebec before he was forced to stop in Thunder Bay, Ont., when cancer spread to his lungs.

Fox died months later at the age of 22 after raising more than $22 million for cancer research.

To date, the Terry Fox Foundation has raised more than $600 million.