Did ZCIs on hilly terrain a few days ago - when I was riding, the intervals did not feel that hard, but the next 24 hours of recovery, I was feeling it.
Quick question - being that the terrain was hilly, I was able to keep my lap avg power where I wanted to, but my power output was not steady or constant at all. Should I try to find a flatter route to do ZCIs on to keep the power more constant, or just don't worry about it?