I tried to follow rather general training principle that I use for any activity, match your workouts as closely as possible to the event in quiestion. We do this all the time in our programming. For tennis or golf we incorporate movements which will aid in shoulder mobility and rotation. A marathoner or triahtlete will build over weeks up to the race day load so that the body is familiar with the stresses placed on it. And on and on... However, I just wasn't sure how to get close to 12 miles and 25 physical obstacles.
The event’s obstacles vary but in general the difficult ones emphasize upper body pulling and pushing such as, log carrying, wall climbing, pulling yourself out of the ice-water dunking area, etc. So, as I come to a stop near the play equipment, I’ll grab the monkeybars and do pull-ups, then switch to pushups or some squats, If there’s a bench I’ll do dips or step ups. Some challenges also require jumping or leaping so doing a set of short sprints or pretend basketball layups will really boost the heart rate. It varies and I usually go for about 2 minutes. After that, I’m back to the field for more jogging. Yes, it probably looks ridiculous, that's the nice thing about ear buds....I don't hear people wondering what the hell I'm doing on a children's playground.
Try the playground workout as a fun change up to a boring road run that incorporates some strength work. Regular cardio/strength circuits are fun too, but it’s nice to be outside while you can.
The double bonus was taking Jack with me once and he played with a friend he saw while I worked out. Initially, he said he would run with me a little bit but when he saw his friend, he was off and gone. So, working out while he plays pirates beats sitting on a park bench buried in my iPhone.