Last night was a GREAT interval workout for the group and I, 4x 1mile OUCH. Instead of the classic flat run or track for intervals we did something different. I threw in a little hill at the end of the interval. So it was mile repeats Ultra style.
For an audio reference this is the sound going thru my head as we started each interval:
The above link is the song from a movie soundtrack, but can you name the actual song?