I am a 54 y/o male returning to cycling. When I left HRM were just becoming vogue. My training consisted of riding ridingand more riding. I would ride with a club on a Saturday, get dropped in the hills. Lick my wounds and spend 3 weeks doing hill intervals. Go back ride with the club and challenge every hill. Someone would breakaway and I would chase em down. Well, those days are gone. 20 years older and everyone today has a powermeter. I have a computer program that estimates power. Not accurate in windy conditions. I put in almost 4000 miles last year. Believe it or not I was still smoking cigarettes. I did a little bit of hill work. This year I have 2500+ in and quit smoking as of June 7th. Here is my dilemma. I would ride at 145 average HR and not get winded. When I climbed hills I would be pushing 160, not winded. Now when I ride 150 I am breathing hard. My resting HR is 10 bpm lower. I know I am in better shape because I can climb for 30 or more minutes, something I could not do last year. My muscles do not burn during long hilly rides and as long as I keep hydrated, I do not cramp. I am 30 to 40 lbs overweight, but its coming off I was 70lbs overweight. I use deep breaths to keep my HR down. I usually drop my cadence down from 80-90 to 50-60. If I raise my cadence on the hills my breathing becomes labored. My self analysis is my heart is adequate to above average. My leg strength is adequate, but lung capacity is below average. Its alot better than it was, but it is weak. Right now I put in 200+ miles per week with about 4000 feet of elevation gain. I have incorporated more hill work the last two weeks, but improvement is stagnant. Do I just need to go out and blow up a few times in the hills? Push it until I am in oxygen debt? I can do hill sprints that are between a 1/4 and 1/2 mile and 5%. My HR goes to 154 to 158. I can recover within 2 minutes. At least HR goes down to 130-134. Still breathing hard tho. I know its alot of info to digest. I want to get back to riding with groups and not get dropped.