I enjoy both cycling and backpacking, and I'm at the age where "use it or lose it" is a reality. Monday and Friday are road cycling days, Wednesday is mountain biking (a bunch of short,steep hills), Tuesday and Thursday I throw on a 15-20 lb pack and hike the same hills as Wednesday's ride, then for Saturday and Sunday, one is a long ride or hike, the other a rest day. When summer and backpacking season get closer, I up the weight and miles with the pack. When school shuts down for the summer, I have a much more open schedule and can put more miles into everything!