I'm with NelsonMuntz. I usually jog first, then lift, and then run again (if I have time.) However, I don't jog very much BEFORE the workout. I just do a little bit (maybe a half-mile or so) to loosen up and get going. That way your energy's not sapped as much when you hit the weights. I don't know about you, but if I tried to run any substantial distance before a workout it drains me MUCH more than doing it the other way around. In fact, the hardest part about running after you've lifted weights is just holding your arms up. My shoulders are usually good and tired by then and the sheer weight of my hands and arms gets heavy after you've been running for 15 minutes.