Push an inverted vaulting box including 1-3 centre sections (possibly filled with medicine balls) back and forth over a certain distance (approx. 10-15 metres) (push the bob). The two groups compete against each other. When one participant has pushed the sled back to the start, his team-mate takes over the sled. As soon as each participant has completed two runs, the race is over. Which group is faster? Any number of series can be completed in the time available, but longer recovery phases must also be incorporated (if necessary, reduce weight by removing medicine balls).