Spinning will definitely help. You'll improve your cardio-respiratory ability and build muscles needed in biking. It's no replacement for time on the road, though.
Yes, they do make ponytail helmets. I can't remember where I saw them.
TE, maybe?
I love my Sidi's . The Blaze model is a cross between mountain and road just in case you have to walk.
My 3 cents
By the way, that's quite a goal you've set for yourself. But we all know you can do it.



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It's pretty hard to go wrong with Sidi's -- they tend to fit well and last a long time. But now's the time to try on other shoes for comparison sake. I own a pair of Specialized, and have owned Diadoras and Duegis in the past. Fortunately, I don't have issues with hot foot, so I do OK with just about any shoe that fits my small foot. I bought the Duegis in the early '90's, and they have zilch in terms of arch support, etc. Nevertheless, they're still comfortable for me on rides -- even a century.