The outdoors is your best gym, at least until the winter breaks. It's free of charge, offers challenges and views at the same time, and is more accessible than your local weight room. In fact, while there were <a href="https://www.statista.com/statistics/244922/us-fitness-centers-und-health-clubs/" id="6e5c6735-5ae7-31bb-aa93-a214c2436ff5"> over 36,000 gyms recorded </a> in the United States, there are <a href="http://www.americanhiking.org/wp-content/uploads/2015/05/AHS_RPT_fnl_LOW.pdf" id=...