Please help achieve my goal.

The Royal Marines Iron Challenge takes place on 19 Sept 21 and consists of a 2.4 mile sea swim, 112 mile cycle around Devon/Dartmouth, and a marathon, 26.2 miles along the South West Coastal Path with a total climb of 3500m, in under 17 hours.

The challenge was set up to raise funds for the fabulous work of The Royal Marines Charity helping serving Royal Marines, veterans and their dependants.

The charity helped me out in 2004 and I want to give back tenfold,
Please help me do that with this first step of raising £1664.