forty-five minutes on the exercise bike and nineteen flights of stairs.  for some reason, biking in the gym bores me to tears so i don’t do it often but i wasn’t in the mood for the treadmill or weights.  the non-padded seat kills my (non-shrinking) butt.  i’m not sure whether my glutes actually got a workout or if they were just numb from the seat but they were not tremendously cooperative in climbing the stairs back up.