Intervals on the treddy

Did intervals (400 X 4) tonight on the treddy:
Stats - total 2.5 mi, 38:23 (w WU & CD; w/o WU & CD - approx. 29:56), 343 cal

* Warmup 400m (3.5 mph) -  4:20 (time is cumulative)
* Run 400m - 4.5 mph, recover 400m - 4.0 mph* 1st interval/Run - 7:39; Recover - 11:20
* 2nd interval/Run 400m - 14:38 (mile 1, with WU); Recover - 18:20 (mile 1, total 1.25 mi)
* 3rd interval/Run - 21:30; Recover - 25:20
* 4th interval/Run - 28:38 (mile 2, with WU; Recover  - 32:16 (mile 2, total 1.25 mi)
*Avg speed - 4.2 mph, avg pace - 14:17/mi, 324 cal
*Cooldown/2.5 mph, 0.25 mi (400m), 6:07, 19 cal (total - 343 cal)
I did much better than I thought would.