Ah, the philosophy of exercise is a very personal topic for me. I've had many systems in the past, all of which have worked pretty well, but the one I've settled on, I must say, is the most beneficial.

I have a very regular schedule based on the theory that I need to actively work on three domains of physical ability:

1)Strength and Vigor
2)Balance and Flexibility
3)Speed and Coordination

I lift weights for #1, do yoga for #2, and play racquetball for #3. So I really should be marking all three of those things up top, I just put competitive sports because racquetball is probably the most fun of the three, although I enjoy both.

I do each of those things three times a week. There is a day when I do just yoga, yoga with lifting, and yoga with racquetball. This way, each activity is done once all on its own, and once with each of the others. This ensures a good balance on all of them. So, my 9 activities happen in 6 days, and I take Sunday as a "focus" day, uniting the three activities and absorbing the work that I have done throughout the week.

I have an amazing diagram for all this, including colors and the blending of colors with the proper days incorporated at the end of all these triangles, etc. I would put it up here except that 1) I don't have a scanner and 2) I'm afraid someone will steal my awesome diagram. Yes, it's that cool that I worry about it.

As you can see, I've put a lot of thought into this. But if I didn't have such a strict schedule to focus on, I'm absolutely positive that the pressure of my school work and professional future would make me cave. I would literally go insane. You think I'm joking. I'm not. This routine is saving my life, everyday.