Re: Aikido - Is there Randori? Is Aikido a Workout?
I think that if you want to systematically train for aerobic fitness, you're better off not counting on aikido to do it. In partner practice you can often get a good head of steam going simply by getting up as quickly as you can after taking ukemi, but you can't count on your partner being able to train as fast as you want, and your practice is periodically interrupted when sensei wants to demonstrate a new technique or illustrate a point. For aerobic fitness, I'd seek an outside activity where you can exercise continuously at whatever level will give you a training effect.