Originally Posted by
LGHT
Ok getting to 157 and up won't be a problem, but I'll have to really work on keeping it above 157 for 15 minutes. Would it be better to try and do 2 intervals of 10 minutes or 1 interval at 15? I just looked at my route and I have 2 big climbs that I currently average 10 min to do. I know if I push hard I can probably maintain that max hr for the entire climb, but after I'm done it's all downhill. <snip>
It's best to do what you can do. Sure, 2 X 10' will work great. When you can hold the HR for those, try 3 X 10. Then try a 15' interval. It's common to do 3 X 15' or 2 X 20'. Few do more than that.
Be careful to recover well between hard rides. Here's a good read about preventing overtraining:
overtraining prevention