I think I know why I've struggled to fully latch on to swimming and cycling. Part of it is just starting out new. But I can't really play the newbie card anymore, particularly with swimming. What I'm missing, I think, is the thrill of competition (except for the occasional instances when, unbeknownst to the swimmer in the lane next to me, I engage in a full-out race with him or her to the wall and back). With running, the sport became more exciting to me when I started entering distance races. I began where most everyone does—with a 5k—but then decided that wasn't enough, so I trained for a 15k and soon thereafter a half marathon, etc. Those events propelled my love for running forward. I was never racing for prestige or placement but rather to challenge myself; to push myself further than I knew I ever would if I—me, myself—had been the only motivating source. I needed the accountability and structure that came with race training. And now, without the race factor, I ...