Does air temp have an effect on lung capacity? I ride mostly roads and usually do not ride in really cold weather but the temp was about 33 - 37 degrees during the ride. I finally got to get out on my new retro MTB on real trails along the ridge on top of a mountain. The ride up to the top was a paved road on a casual grade and I found myself getting a little winded. Granted I was trying to keep pace with the guy I was riding with who rips off 50+ miles on a road ride on a weekly basis. He was riding a single speed and I mine was an 8 speed. I can climb hills on my roady with out getting winded but this ride seemed strange. Every time I cranked up a short farily steep incline I found myself gasping for air. The total overall climbing was about 800ft total according to map my ride. Is lung capacity somewhat like muscle where you kind of have to push it a little to increase capacity? Granted it takes a bit more effort to pedal through rocks and over logs but it just seemed strange that I was getting out of breath so easily.