M/W/(F or Sa)
I usually work out whatever is not sore that day, with chest/back/arms getting preference (unless I have typing or lab work, in which case I leave the arms and shoulders alone).
I do 5-10 minutes on a bike or stairstepper because, and here is an irony, I refuse to run in place. I am also not a fan of circular tracks.
My legs are difficult to work out. I do 3×10 calf raises with the max on the machine and it tires out my shoulders before my legs. Same with leg extensions but, interestingly enough, I cannot leg curl to save my life.
Most of my lower body workout is sit ups and aerobic exercise (bike, stairstepper, jump rope, etc).