Originally Posted by
terrymorse
That's great, you ought to see results soon.
Are you doing the intervals on a hill? Uphill intervals may be the best way to improve your climbing ability.
Initially, I did it on 1-2% slopes and found it very ungratifying. Later, I did it twice on a 5-6% slope and enjoyed it much more.
I'm hoping to extend the intervals to longer periods with practice.