Try mountain biking, long dirt road climbs will get you breathing HARD. There are some loops off of SR 410 that will make you real strong. I suggest the Palisades loop, 20 miles with a 2,700' road climb plus more climbing on the way down. Some hike a bike but no steep downhill. In 2 or 3 hours you can get a fun workout on lowland trails when the wether is shitty in the winter. You are working so hard you don't get cold. It's not bad riding in the rain 'cause your in the trees.