Eric Liddell.
Why did Eric Liddell not run on Sunday?
A devout Christian, he refused to run on the Sabbath and was at the last minute switched to the 400 metres. In truth, Liddell had known the schedule for months and had decided not to compete in the 100 metres, the 4 × 100-metre relay, or the 4 × 400-metre relay because they all required running on a Sunday.