Find a hill of approximately 50 metres. Run up it as fast as you can with a sandbag over your shoulder, dump the bag at the top of the hill and jog back to the bottom of the hill. Sprint back to the top of the hill, collect the bag and return to the bottom of the hill. Repeat the sequence until you have completed 5 loaded hill sprints and 5 unloaded hill sprints.
Record your time.
Train hard!