Re: Poll: How important is solo training (ie by yourself) in your aikido training?
Practicing ukemi. Practicing body movements such as irimi and tenkan. Practicing deflections. Practicing how to attack properly.
If you can do these things by yourself and keep good form, posture and balance, you are more likely to do so with a partner.
At the same time, you cannot just practice by yourself and expect to improve. You must practice not only with a partner, but ones of as many different sizes as possible. This will help you do the technique at the right time and at the right distance (as mentioned above).
A better question would be what ratio of solo training would you have with partner practice? I would say between 40/60 to 30/70; 50/50 for beginners.