Hi To start off, what is the 300 club? Is it a fitness "elite" club only for Spartans with a capacity of only up to 300 members at a time? Do you need to have maimed, gutted, decapitated, traumatised or bruised countless Persians to get in? Back to reality. I'm 14 and I'm aspiring to go Paras as an Officer. So I was thinking if I should start on other endurance sports on of top long distance running/ marathoning. If so then what events in particular should I train for? I've considered the triathlon so far.