NSV! Treadmill

We went to the Y yesterday during lunch and used the treadmills. I discovered something while I was on the treadmill. When I first started losing weight in Sept I could only walk at a speed of 1.5 and I ran at a speed of 3.0. Now I walk at a speed of 3.0 and run at 4.1. I have doubled how fast I walk. Before I could walk a mile in over 35 mins. Now I can walk a mile in 20 mins. That is my first huge NSV.