Originally Posted by
RNAV
For being your first time, perhaps you bit off more than you can chew by starting with 2 minute intervals. Try starting with 30 second intervals, then work your way up to longer durations.
Actually I would go the other way. The shorter they are, they more painful they are, if you do them right. Long intervals are more about pacing and pental toughness. Short intervals are like poking your eye out with a stick...
Also, OP, I just noticed a notational issue. The " means seconds and ' means minutes. So 2" intervals means 2 seconds, which I don't think is what you meant...