Easy run 6 miles -- Pace 9

I did not feel too much tired or sour muscle from the leg after yesterday's 

16 mile run. But I still just ran an easy 6 miles with the pace around 9:00.

The weather is perfect for the running. Got up at 7am, and started around 7:18.

The only thing I did not understand too much is that why my heart rate still 

around 180, even for a slow run. 

Here are the splits:

Split	Time	Distance	Avg Pace
Summary	53:57.1	6.01	8:59
1	9:16.1	1.00	9:16
2	9:02.4	1.00	9:02
3	8:59.4	1.00	9:00
4	8:41.7	1.00	8:42
5	8:58.1	1.00	8:58
6	8:55.1	1.00	8:55
7	:04.3	0.01	7:15