This sport called triathlon is not for the gear-less. There is so much stuff you have to have (and remember to have) for this sport - and especially so for Ironman because the distance is so great. These are just a couple things we've had to pick up: water bottles and CO2 cartridges. We'll each have four water bottles on our bike (and drinking 10-15 by the end of the bike) and 3 CO2 cartridges on the bike in case of flat tires. And these are the most benign of it. Don't even get me started on salt tablets and body glide!