Hi Rob,
As you know, I like doing an obstacle course "Walking through the Forest" with my Tiny guys (4 yr olds).
The older ones, I use the kenpo cards *not to be confused with Kenpo Kardz* - which is a deck of playing cards. Teams - captains choose a card from any of three piles. Whatever the face value is, I call out an exercise (push ups, sit ups, jjs) and the team does them.
All age levels - relay races. Run to me, do a tech, blocks, punches, kicks, whatever is chosen for the particular race, and go back to tag the next person.
They love to run. Parents love them to run!! KT