I find these values work in TP within Friel run pace zones
Z1 - up to 77%
Z2 - 78%-87%
Z3 - 88%-94%
Z4 - 95%-100%
Z5a - 101%-103%
Z5b - 104%-111%
Z5c - 112% and up
I also find using pace zones in workout builder works best when doing speed work and to keep over-zealous athletes in the slower zones they should be staying in....especially newbies!
Z1 - up to 77%
Z2 - 78%-87%
Z3 - 88%-94%
Z4 - 95%-100%
Z5a - 101%-103%
Z5b - 104%-111%
Z5c - 112% and up
I also find using pace zones in workout builder works best when doing speed work and to keep over-zealous athletes in the slower zones they should be staying in....especially newbies!