The C25K program consists of three workouts per week for nine weeks. This is the results of the workout for week two, day one. Program: Brisk five-minute warmup walk. Then alternate 90 seconds of jogging and two minutes of walking for a total of 20 minutes. Brisk five-minute cool-down walk. Result: I completed the workout as planned. I did 1.71 miles in 31:08 for an average speed of 3.29 mph. My heart rate averaged 141 bpm and peaked at 166 bpm. After a bit more research into the anaerobic threshold and the Karvonen formula, perhaps this range is just about right for me. The peak was just a little way into the anaerobic area. I still wore my Vibram Five Fingers for the workout, though I did change my workout path. For my prior workouts outside, I drove to and from a park half an hour away to use the nice wide asphalt bicycle path. For this workout, I decided to try to loop around the lake in a park a couple of blocks from my front door. It has an asphalt trail up the east side of the lake and a street with sidewalk on the west side. There were some changes that made one section more difficult. There is a section of grass on the south end, along a main east-west street, between the trail and street on the west side of the lake. If this section had a paved sidewalk, it would be a little easier on the feet. With minimalist footwear, I land harder on grass than on cement or asphalt. I delayed attempting this route until now because I was not sure I could make it all of the way around the lake park. Now, I know I can. Parts of the workout were a small struggle. I think the apparent amount of struggle may reduce as my capabilities increase. I was expecting the move from the week one level to the week two level to be more difficult. I guess that comes later.