Originally Posted by BarryJo

this might be the most useless piece of advice I've ever seen posted on BF.
For one, what makes you think the OP has access to huge bleachers where he or she lives (Korea).
For another, running bleachers doesn't make you a better climber, it only beats the crap out of your knees.

There are well over a hundred threads on BF discussing this very subject.
Consensus seems to be hill repeats.
What helped me the most was mapping out a route with 5-7 decent climbs, going as hard as I can uphill and recovering on the downhills.
It really does get easier over time.

(edit - rumrunn6, where are you located? I'm in Fitchburg, lots of good climbs within 20 miles of where I am including Wachusett and Temple)