John says laughingly as Devika punches him, "Hey, I actually almost felt that." In response to her question, he says, "Keep your feet on the bars that are on each side of the belt. I'll turn it to a walking pace, and you just step on when you're ready." He turns the machine on then points to two arrows and continues, "When you're ready to go faster, press the top arrow, and when you want to slow down, press the other."