Check out my new (possibly changing) theory: My jogging stroller makes me faster.
Not just by conditioning through the resistance training; no, I mean, during races...while actually pushing my 45lb son. As I've said before, no one likes to be passed by a stroller. Even if they are close to having a heart attack or muscle spasm, they will push themselves as I push closer. It's like a wave in a pool: as the stroller approaches, the pace picks up, rippling through the area. So, as I begin to notice people going faster around me, my instinct is to accelerate, too. And although it's less enjoyable uphill, I find myself hauling tail to catch up with my runaway stroller on the way back down (even with the leash).
The stroller makes me faster. I have no other way of explaining why I've PR'd the last two races while pushing the stroller.