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Good advice these ladies have given. But one thing to add. If you plan to run a 1/2 marathon then you've got to run. Start with short runs then when you can't run more, continue walking. Or do what I did (a totally non-runner) when I had the bright idea of doing a triathlon. I'd run a short distance and walk, doing intervals. My goal was to increase the running distance by 10% each week. Same for my biking. Should have did the same for swimming. When I could do the distance then I started on increasing my speed by as close to 10% each week, but ran out of time to get fast by event time. End result - I finished, badly but finished. For a former 300lb cripple, not bad though.
So, I'd suggest you run and work your way up to longer and longer runs. Work on the speed once you can do the distance. I hope pierini sees this thread. He gave me some great advice about timing how fast I'd run at different parts. He can probably help you more than the rest of us on running. Mostly because well, he's a runner.
They are right though, you don't want to lose muscle to do this. Don't try it. Chances are though, you are going to lose some from doing lots of cardio to get ready for your event. Resistance training will help prevent this loss.
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I will train with you. I will fight for you if you cant. I will die to save another. But I will bleed only for Kimberly.
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