I'm 46-just returned to riding-enough that I splurged on a Jamis Aurora bike. I can ride hours on the flat, but uphill is killing me. I get winded, my heart rate climbs-I've been pushing my self to go a bit further uphill each time before gearing down, but it doesn't seem to get any easier. I am going further distances, but its labored.
Yet, after I come back down the hill (about 20 min of delightful coasting) my heart rate is back down, and I can ride a few more hours in the flat areas with no problem and get home, not really tired. My legs are holding up, its my breathing.
So what am I doing wrong on the hills? How can I build up my endurance? Do I just keep going a bit further up hill each time? I like the challenge of the hills