If your not into running, you could sub biking for it. I don't care for running but I live to bike ride. You could even sub swimming in, as long as you grabbed a kick board and held onto it, giving your upper body a little bit of a break and just used your lower body to get you across the water. You could sub in aerobics as well, all you'd need to know would be the basic calories that you'd burn off during that given distance/time, and find an aerobic workout that met it.
HTH,
Kit
HTH,
Kit