Mayfield, I watched some conditioning vids by him on his treadmills and he mentioned the kidney think in a couple of them, it was a while back, he's the guy that made his own treadmill right?
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No you must be talking about Lemm, that guy was a bit crazy but he was ahead of his time with conditioning dogs with interval training.
Mayfield never really used treadmills, not to say he never did but he mainly used a machine called a jenny/catmill.