S9H. T=73 degrees. Biked 15 miles around neighborhood. Same effort level as running at 10:00" pace. Arms and back hate this excercise! Heart rate stayed low most of the time but legs do get tired. Good strenght building for quads and hamstrings. Knee is fine. Wonder if it's true when they said for every 3 miles of biking is "equivalent" of 1 mile of running. If that the case, I guess I'll take credit for it (=: | 