Throughout last week, British 400m record holder and medal winner at Commonwealth, European, World and Olympic level, Iwan Thomas MBE was providing us a video diary of his first attempt at triathlon, at the Blenheim Triathlon on Sunday. If you missed any of the first videos, check out the links below.

• One week to my first triathlon.
• Iwan gets a bike.
• Trying out open water swimming.
• First go on the aero bars.

Iwan knew it was going to be an 'experience', didn't know what was going to happen - and certainly couldn't have predicted what did! Still, he loved his first triathlon attempt and can't wait to get back into racing and have another go. Here is how his day went in the swim - check back tomorrow morning to see how it all finished.

Race day morning

Swim start: about to get into the water

Swim start