4X1200m Speed Workout

Warm up for 1.5 Miles to Da Vinci. Then started 4 repeats
of 1200m with 4 minutes in between and 1.5 miles cool down.

I stopped the watch after each 1200m. So it seemed very fast, if
we do not consider the recovery breaks. But even for each 1200m,
it was already very fast for me. I think it was too fast, and this will
not help marathon any way. Here are the roughly splits:

Split	Time	Distance	Avg Pace
Summary	44:11.0	6.06	7:17
1	7:59.3	1.00	7:59
2	6:56.2	1.00	6:56
3	6:21.8	1.00	6:22
4	6:23.7	1.00	6:24
5	7:00.3	1.00	7:00
6	8:44.6	1.00	8:45
7	:45.1	0.06	12:30