Warm up
4, 3, 2, 1 @ 18, 20, 22, 24
start @ 5K + 14 shave 2 seconds off each rate change
5 x 2 min on 2 min off all @ 26
start at 5k + 2 last one @ 5K -4
3 x 2 min on 2 min off all @ 28
start @ 2K steadily reduce splits to end at 2k-4 or faster