There are no bugs in the winter, or crowds. The woods in winter are peaceful and quiet. No bugs to bite, creep, or screech. No leaves rattling in the wind. Fresh snow makes it that much quieter.
Winter is a great time on the trails whether nordic skiing, snowshoeing, or even winter camping.
And all are great therapy. Many of you work hard 8 months a year to get in shape and then sit indoors all winter only to end up exactly where you were last spring. He stayed in shape year 'round. As you get older, just maintaining your fitness becomes more difficult, and letting yourselves go just because it's cold outside is a shame. You can continue most of your favorite aerobic activities throughout the winter or you can mix it up with some new winter sports.