Re: Aikido practicality
I don't really have much more to offer than anyone else on finding a school that is the best for you. Like others said, go out and try out a few things and find what you enjoy.
As far as physical development I don't think you'll get enough from Aikido if you currently work out a lot. I'm a runner and I also lift and do total body workouts so I workout 6 days a week. I love aikido but it does not get me in the same shape as my other training.
If you don't workout, or at least don't workout often, then aikido may help you get in better shape. But again, how much better in shape depends on how the school trains.