The best High Intensity Training exercise equipment is a cross trainer that allows you to exercise standing up. You get a far greater bang for your exertion buck standing than sitting, you minimize injury on a cross trainer, and also you minimize the need for warm up. Make sure you try out any cross trainer at least 3 or 4 times before buying, or purchase a cross trainer that you can return. High Intensity Training is stressful, the machines are very different, and you need to select a model that works with your body without injury.