Gawad Adham

HI Kay
to make your aikido skills better, you should practice aikido, however if you want suplemental training to remain fit, then in the broad sense any kind of fitness routine will do you good as long as you remain flexible, and try not to bulk up up too much. pushing weights seems to make aikidoka rely on thier new found muscular strength to preform thier techniques. if you want to be particular, I've found yoga to be quite beneficial for my aikido, giving me a much better sense of my balance, center, and allround posture. I would strongly recomend core training (abs, back, legs etc.) and any thing else for endurance.
solo bokken training (1000 cuts, the 7 suburi,etc..), is usually quite helpful as well, but get someone to show you proper form and posture first.
hope this is helpful
G A