Physical conditioning should be on everyone's list -- without it many survival situations are much more demanding. In 2002 I bought myself a lifetime membership to a local gym and have been a regular since. The older you get the tougher it is to get back in shape and at a time when it is even more important.

The first 6 months back in the gym was tough for me because I was continually comparing myself to a much younger me. I'm stronger now that in 2002 but nowhere near my conditioning while on active duty. Still, it's a goal ...