Metabolism. Most of us wish ours was a lot higher, mostly so we could eat as many donuts and burgers as we wanted to without gaining weight. Tracking how our body reacts to changes in diet and exercise is tough, slow going work with no bottom-line number to really tell us where we’re at. However, there are devices that can do it, except they’re not in the $100 get-at-Walmart type of gadget.
For example, Cosmed makes a hand-held device that can track just how many calories an individual needs. You just breathe into it for seven minutes and then you get a report with your caloric needs, including how much exercise you need to lose x number of pounds and/or gain lean muscle mass. Just one catch – it costs $7,900.