I find the treadmill a good place to do a progression run so I went to the gym with the intention of doing a 12 mile run increasing the speed by 0.1 mph every mile through 12 miles. I set the treadmill at 1% and started the first mile at 7.9 (7:35). Every mile I increased the speed. Mile 10 was 8.8 (6:48) and that was all I could do, so I did the last 2 miles as a cool down. I was dissapointed I had to bail on the last 2 miles, but it was a good run.