It's Getting Better

I ran a 9:11 mile on Friday during my jog. I had the treadmill up to 6.7 mph (8:54 minutes per mile pace) for a while, but the heart rate eventually jumped to 172 so I had to back it down a bit. In all, I ran/walked 2.3 miles in 25 minutes, including a warm up and cool down walk totaling 8 minutes. I'm trying like crazy to stay within the prescribed limits but I'm too hard headed to comply 100%.