As far as people who can't get enough of the outdoors goes, San Diegans are at the top of the pile. There are plenty of ways to get that outside adrenaline rush here other than your commonplace runner's high or hitting the waves (not everyone knows how to surf!). If you're chasing that socially acceptable high, take to the water, sky, or the spirit world -- these experiences will leave you more hyped than any workout you'd get in at a CrossFit class (and won't immediately brand you as a douchebag).
If you want to stretch a minute into eternity, jump out of an empty plane with a stranger and nothing but a parachute strapped to your back. That’s exactly the experience the skydiving operators in San Diego, like GoJump Oceanside or Skydive San Diego in Jamul, want to give you. The weather here is almost always conducive for a jump, so suck it up and cross this one off your bucket list.