Originally Posted by

**ulrichw**
I haven't read the book, but this doesn't sound right to me. (way too few work intervals in the first set).

I'm guessing that the 2 under, 1 over refers to the time at the under/over pace, not the number of intervals at the pace, so:

3x9OU(2U, 1O) would be: 2 minutes under, 1 minute over, 2 minutes under, 1 minute over, 2 minutes under, 1 minute over, rest 6 minutes - repeat two more times.

Your second set would be:

3 x 10min (3u, 2 o) would be: 3 minutes under, 2 minutes over, 3 minutes under, 2 minutes over, rest 6 minutes, repeat 2 more times.

(It's possible that the set would start at the over interval, because I'm not sure how much sense it makes to start with the steady state).