Darren Burgess, head of fitness and conditioning at Liverpool:
"For this one you don’t need a ball – just an iron constitution. Stand on the goalline and sprint to the 18-yard line, before jogging back to the six-yard line.
Turn and immediately sprint to the halfway line, before jogging back to the 18-yard line. Now the hard part: turn and sprint straight back to the opposing 18-yard line before jogging back to the halfway line.
More after the break
Once there, sprint back to the six-yard line, jog back to the 18-yard line, finishing with a sprint back to the goalline. One of these should be enough!"
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