This final BUILD workout of the block brings back more "varying hills" just like PROG. 2! Except this time, the hills are all, awkwardly, 1 SPM less than PROG. 2. Your challenge is to match or beat those hill split/500m averages from the previous workout, and keep in mind a 2-5 split second shift for every 2 SPM change!

Workout:
2 min @ 17 SPM
2 min @ 21 SPM
2 min @ 19 SPM
2 min @ 23 SPM
2 min @ 15 SPM
2 min @ 21 SPM
2 min @ 17 SPM
2 min @ 23 SPM
2 min @ 19 SPM
2 min @ 15 SPM