This is probably a noob question butwhen I get into a nice paceline I find it hard to keep up. I can do 24mph just fine but when we bump it up 2 mph to 26 I physically cant hold it. I have the endurance from cross country running and I have sprints and hills. I just need to bump up my speed on flats. Are intervals the way to go? If so, how long and how many? 2 min max heart rate 5 min recovery and do that for 30 min? 20 min a little below the max and then recovery then again? Im so lost.