start walking... honestly, thats going to be best for you. start now with walks around the block doing what is comfortable and keep doing it and try to go a little further each time.
last summer we did the komen breast cancer walk with people of all ages. my 5 year old twins managed it just fine as did "older" relatives that are not "physically fit".
i think it sounds a lot longer than it really is. those walks are generally geared towards all abilities, aid stations well placed along the route and always places to stop to rest. you are usually caught up in the moment, talking and enjoying the day with friends and family and you dont realize you are walking as much as you are.
have fun!
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