Day 4

alternate strength. Was still sore from 2 days ago's core workout, and swam yesterday (and want to tomorrow) so contrived a new alternate: walking, then leg and upper back strength. walked 20 minutes at 7.0 incline at 3.6mph. hit 140bpm after 4 minutes, hovered near 150 the rest of the time. supposedly burned 200 calories -- not bad! felt like a fairly vigorous walk - was sweaty, but not tired. then did machines for front and back of upper legs. then rowing-type machine for upper back. a little of a wing-flapping machine for shoulders.