The triathlon involves a 2.5 mile sea swim, a 112 mile bike and a 26.2 mile marathon run.
Completing the triathlon has always been a personal ambition for Grant, but he is also using the opportunity to raise money for the Swanage Lifeboat Station Appeal and Cancer Research UK.
Grant would welcome any support and encouragement before the big day! If you would like to sponsor him you can visit his Just Giving page here.
Good luck Grant! And thank you to all the crew and lifeguards who will be providing safety cover at the event.
