back extensions and quarters

For time:
21 Hip-Back Extensions
Run 400 meters
18 Hip-Back Extensions
Run 400 meters
15 Hip-Back Extensions
Run 400 meters
12 Hip-Back Extensions
Run 400 meters
9 Hip-Back Extensions
Run 400 meters
6 Hip-Back Extensions
Run 400 meters
3 Hip-Back Extensions
Run 400 meters

All hip-back extension sets unbroken, runs at 1:30 to 1:37

21:07 total

BW 188