I find running pairs well with music -- I'm into electronic dance music, and running allows me to simulate how the music would feel at a nightclub: you're physically engaged, sweating, does the music push you forward or pull you back? What are the cycles of tension and energy and are they effective? I also find myself more able to really dig in and listen while running: I've found myself gaining a much deeper understanding of albums after I've run with them.

I would find running without music to be frustrating and boring. Although, after about 15-20 minutes, I just drift off into thought-land and kinda forget that I'm running, so maybe it'd be doable. I guess that's runner's high/endocannabinoids for ya.

I find weightlifting less fun but it's SO healthy (and quick) that I push through and do it anyway.