It's often said that you don't need to be fit to learn Aikido. And that's true - up to a point. Since timing, softness, blending and unbalancing should be used instead of just muscle-power, you need to be neither very young nor super-fit to do Aikido.
But is it sensible to do a martial art without being fit? Personally, I don't think it is. For one thing, the fitter you are, the safer will your practice become: muscle strength and flexibility will support your joints, cardiovascular fitness will ensure you don't get tired quickly. And what is more, since Aikido is, at its best, a very dynamic martial art, one of its benefits is (or should be) that it helps to make you, and keep you, fit.
But to be truly fit you need to work at it. And the older you get the harder you have to work. While I am not exactly unfit, I am by no means at an optimal level of fitness. So my New Year's Resolution this year was to get myself fitter. The video below shows your a short review of an iPad app which I am using to help me achieve this goal. It's call You Are Your Own Gym and I can honestly say it's the best $2.99 (£1.95) I've spent this year.
You can read my complete review of You Are Your Own Gym here: http://bitwisemag.blogspot.com/2015/02/you-are-your-own-gym-app-review.html