For someone of a healthy weight and in good cardiovascular shape (swimming and cycling) how long should I wait before my first marathon? Until last month I never ran more than 5 miles in my life, but I now run 15k+ about once a week.
I would like to run a marathon in about 5 months. I've found a 16 week plan that seems reasonable to me. Would that be too soon since I have been only running for 1 month? Based on my run last weekend (16k) I am guessing I could complete a half marathon in under two hours today.