40 Minute, 3.8 Mile Treadmill Routine:

Time Speed
0:00-5:00 4.0
5:00-8:00 6.0
8:00-10:00 6.5
10:00-11:00 7.0
11:00-35:00 Repeat minutes 5-11 four more times
35:00-40:00 4.0
Total: 3.8 miles