The heading for my run tomorrow says aerobic interval threashold 2x10 minute intevals in high 4, but the description below is completely different
WU: 20 min. in zone 1-3 + 5 X 30 sec. building speed. MS: 3 X 10 min. steady climb in high zone 4. Run steady back down the hill and start next climb. CD: Zone 1.
Which one do i follow?
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