my routine:

cardio routine:
30 minutes of running with about half a lap of hard running (or sprinting on straightaways)
3 laps low walking

weight routine:
30 min running for warmup
70lbs, 5 reps each leg, 4 sets of lunges
120lbs, 50 reps, 4-5 sets of calf raises (may have to up my weight)
1-2 laps low walking

low walking is where you get your butt as close as you can to your heels while walking forward. I say 3 laps is what I do because I do it on an indoor track, which is substantially smaller than a typical outdoor one. Nevertheless, low walking is an incredible way to build up leg endurance, I've found.

For running, I've found that a weird mix of lynyrd skynyrd and russian choral music works best for me.