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I have been working out 3-5 times a week Cardio 30 minutes and light weights 20min. and I am gaining weight. I know it's muscle mass but I want to lose fat and then tone should I stop with the weights and just increase my cardio? I only want to lose like 10-15 lbs.
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Don't listen to Iceman. He means well...but the kid is nowhere near informed.
Are you sure it is muscle mass?
"Cardio" has been touted as essential and optimal for losing bodyfat. This is far from the truth. Activity as a whole is a very inefficient means of expending calories when compared to the amount that bodyfat stores. For example, a typical 150lb man might expend 100 calories (gross) by jogging a mile. A single pound of bodyfat is worth about 3500 calories. Once you widdle down to the net bodyfat expenditure, that man has to cover 40+ miles just for a single pound of bodyfat. With the abuse your structural system would take in doing so, that's cutting off the nose to spite the face.
The most efficient way to expend bodyfat is by dietary modification. Caloric reduction will put you in the situation where calories in is less than calories out (which is necessary to lose any tissue). The value of caloric reduction over activity is twofold:
1. Any activity, including merely existing, requires calories. The more intense the activity, the greater the PERCENTAGE of calories chosen from sources other than bodyfat. That means....the less active you are, the more bodyfat you are using to meet your caloric needs (percentage wise, not in total calories). Eating less throughout the day means that you have a caloric need that must be met by burning body tissue. Since most of this time you are probably not very active, you are burning off small bits of bodyfat.
2. The caloric deficit is spread out through the whole day. You miss 50 calories here...100 there....it's not all in one big lump. That makes it less of a stressor, which means the body will be more inclined to use bodyfat to make up the caloric needs. If you suddenly need 300 extra calories in an hour, the body has to scramble to come up with it in any way possible.
The other essential element that complements caloric reduction is proper strength training. Proper strength training promotes muscle sparing, which helps keep your metabolism even (if not greater). Otherwise, your body is going to try to reduce its caloric needs. Muscle tissue is very calorically demanding...even at rest. Bodyfat is not. What do you think is going to be removed if it is not used?
Proper training is not messing around with light weights, however. It is brief and intense workouts done infrequently and safely. This should be the crux of any valid exercise program.