In response to my second IM training programme article, Neil asked me “I have just read your ‘Ironman Training Program’ on your website and you talk about Carl’s base training. I am training for my first UK 70.3 and just wondered how long the base training should last?”
My answer to this is if you have 12 weeks that is ideal, but you also have to fit in at least 3-4 months of speed, LSD and race prep. So you will need at least 6 months to your race to allow you a 12 weeks base.
6 is the minimum you should ever do, to effect any physiological change. Most of us end up compromising and doing between 6 and 12 weeks due to lack of planning, family and work commitments etc. But if you were a pro I would make you do 12 weeks. Unless you were planning two IM or 70.3 races a year, then I would split the 12 week base into 2 phases.
I hope that helps Neil and good luck with your training and race.