I need help. I failed a physical and lost a good job. They said it was the step part that I failed, which is bugging me because I can jump on a Stairmaster for a ½ hour or more at a decent pace any day of the week. So I am thinking it was a heart rate problem? Besides losing weight and diet what should I do change machines? I got on this machine that was like stairs on a conveyer belt and it whipped my ass within 4 minutes. Should I concentrate on that machine?