My lung hurt like crazy! It took a good 30+ mins for it to stop. I've never had that happen before. I would expect that after I quite smoking but that was well over a year ago and I've hiked since then w/o any issues.
We're going to go again today. I'll stay at 3 miles for awhile. My daughter and I are "training" for the 5k turkey trot the morning of Thanksgiving. I've never done one.