So I'm base building and have been running 60 miles a week and swimming 9.3 miles a week(about 1 hour a day, 5 days a week). From what I've read swimming has a 1:4 mile ratio to running. What does this mean for my training? That I've been running 60 miles a week and swimming 9.3 miles, or running an equivalent of 97 miles a week(in training stress) if you factor in the swimming conversion?
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I haven't read anything on this, but based on my own experience, I assume it depends on how hard you swim & what stroke you use. I use an arms-only crawl and go a little slower than you do. Based on how long it takes me to swim a given distance that way and how hard the effort feels, I figure every mile is giving me the same stress on my heart & lungs as about 5 miles of easy to moderate running. Hardly get any stress on my legs (which is the idea), although the increased blood flow and occasional kicking do seem to have the same effect as a warmup or cooldown.
I would guess you're putting 80-110 mpw worth of stress on your heart & lungs but only 60 on your legs. If 60 running is all your legs can handle for now, this much swimming may help you race faster than you would otherwise. However, if you try to jump your running mpw quickly to your current running-plus-swimming-equivalent mpw because you don't get tired at the higher mileage at first, I think you'll risk injury.
Split the difference.Think of it like 75 mpw.
My guess if aerobically you are pretty strong right now. Swimming is really great cross training because it works a number of muscles throughout the body that you don't get with just running.
Thanks for the reply.
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