You don&#x27;t need a machine other than a watch. You can use almost any exercise. Keep a thirds ratio. So 1 minute full, 2 minutes not full. Or 20 seconds full, 40 seconds not full.<p>I have used the treadmill and just ran. Or the stationary bike. Or when I want to really get at it I&#x27;ll use the treadmill at a jog for my &#x27;rest&#x27; and do my full on with heavy DB snatches or something.<p>It is really not that complicated, and only requires that someone put in some effort.