Jogging is an introspective activity for loners. You don't need friends to jog. You don't need to coordinate your schedule or talk to anyone along the way. It's just your stamina and your thoughts and your path. Of these three, the path is about the only thing you can really control, so best to make it a good one. Park on the far side of the big William M. Powell bridge and head out toward Miami Seaquarium. The white-rippled waves and brisk breeze might help you rev up those endorphins. You can hang a left at the Seaquarium and take a long loop through Virginia Key or continue straight to Crandon Park (cut across the road at Sundays on the Bay to hook up with the park's nature trail). Either way you'll find plenty of outlets, like the brush and dunes of Bear Cut preserve, to cut your midlife angst to pieces. Kick up some dirt behind you and let your mind wander freely.