It all depends on how much you do. For example, I try to condition every day, but I don't do a huge workout. I do just enough to push the limit I hit the day before in a handful of different exercises (i.e. pushups, crunches, leg lifts, pull ups, etc). I do them in bursts (kind of like workout of the day) and try to tire myself out.
Long story short, I do a little every day, but I imagine others have bigger workouts in less frequent intervals. It should be whatever fits into your schedule, but can still push your limits and really accomplish something with each workout.
p.s. You do Aikido?? GOOD CHOICE.
