Subject: RE: 8 Month IM program In all honesty, I don't think you HAVE to run a marathon nor bike 112 miles prior to completing an IM. I agree with the other poster, trying to incorporate a marathon training plan prior to a structured IM plan could lead to burnout, or worse yet, injury. I followed the Super Simple plan for all 3 of my IMs, and while I wasn't on the podium, or punching my Kona ticket, I did finish with some pride (12-14 hour finishes ) and stayed out of the medical tenet afterwards.
One thing the Super Simple plan doesn't discuss is your nutrition. During your long rides/runs, Experiment with different nutrition and see what your stomach can handle. I am a GU an EFS guy. It works for me. Others, not so much.
I would encourage you to try and run after a 4+ hour ride and see how you feel. As much run fitness as you are trying to establish, I think you will find you may not be "running" the bulk of your marathon.
Have fun.
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