Suspect you have a sluggish metabolism? You might have hypothyroidism, or an underactive thyroid gland, which afflicts about 25 percent of American women — many of whom don't know they have the condition, according to the American Association of Clinical Endocrinologists. "The thyroid gland controls your body's metabolism, so one of the first signs that it may be off is an inability to lose weight," explains Pamela Peeke, M.D., professor of medicine at the University of Maryland and author of Fight Fat After Forty. Your doctor can determine if you're suffering from hypothyroidism by running a blood test. If you do have an underactive thyroid, you'll be treated with a synthetic thyroid supplement, which you will need to take for the rest of your life (it will return your metabolism to normal, so it should be easier to drop unwanted pounds).

Try this interval-training trick on the elliptical trainer: Ride for 30 seconds as fast as you can, then immediately reverse your direction and ride for 30 additional seconds just as fast in the opposite direction. Rest 60 seconds, and repeat. The force of stopping your momentum, as well as going from a dead stop to full speed twice in the same interval, will give your fat-burning efforts a massive boost, says Alwyn Cosgrove, C.S.C.S.


When you exercise on the rowing machine, try this interval workout: Row for 60 seconds, note the distance on the machine, then rest 60 seconds. Repeat, only this time, row for 55 seconds and try to match or better your distance from the first time. Rest 55 seconds, then repeat, reducing the time to 50 seconds. Continue until you can’t beat your original distance.
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Before we answer those questions, it’s important to understand how fuel (carbs, fat and protein) is transformed into energy and in which cases they are stored as fuel. To be used by our cells, the different types of fuel must go through several stages of transformation to become the one and only form of  “usable” energy: adenosine triphosphate — more commonly referred to as ATP. ATP is the universal energy currency for many living organisms from mammals to insects and fungus to plants.
Some of us no longer have the strong joints we had as teenagers. Jogging is out of the question and walking doesn’t cut it. The good news is elliptical trainers provide an intense, low impact cardio workout. In fact, a 145-lb. person can burn about 300 calories in 30 minutes on an elliptical trainer. That’s about as many calories as running burns, but without the joint wear-and-tear. https://www.youtube.com/watch?v=-MqB5nq2z2w
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