Your 24 Week Half Iron distance Plan from a Level 3 British Triathlon Coach Welcome to your training plan! This training programme is designed to guide you through a full 24 weeks of training and be prepared ready for race day at a half-iron distance (70.3). The half-iron distance is a major physical challenge and it is very important that you are ready to undergo the training. We advise anybody taking part in an event like a half-iron to be in good health, seek advice from your GP if you are ...