8 Miles at Hains Point w/ Intervals

Today was another beautiful day for running.  I had 8 miles on my schedule for today.  I decided to try running some speed intervals with one mile marathon pace, one mile 10K pace.  However after the 4th mile (the second mile of 10K pace) I had a slight twinge again in my left knee.  I decided to run the remaining 4 miles at the slower pace.  However after the next two miles my knee felt great so I ran one more mile at 10K pace before finishing with a marathon pace mile.

By the way, marathon pace = 9:00/mile (approx) and 10K pace = 8:10/mile (approx).