Always eat more than 1200 calories a day!

A 5'2" 19 year old female weighing 100 pounds (which is WAY too small anyways but this is the example given)... needs 1,200 calories to just sit around all day and do nothing. This is how it's broken down (scientifically)

-The heart needs 12% of the calories (144 cals)
-The kidney needs 12% of the calories (144 cals)
-The Liver needs 23% of the calories (276 cals)
-The brain needs 23% of the calories (276 cals)
-The skeletal muscle needs 30% of the calories (360 cals)

You should also think about calorie cycling. You see the human body adapts to our environment and to our lifestyle. So if you eat the same caloric intake each and every day, the body adapts. So you need to stay one step ahead of the body. On a cardio day, decrease your calories by 200, and the next day increase it by 200. Do this a couple of times per week, and hopefully you will avoid the dreaded plateau. Besides you are moving away from needing to focus on fat loss, now you should focus on keeping the muscle mass and growing it. At 5'5 and 17% body fat, your "weight" includes alot of lean muscle. So your BMI may not be accurate.

Muscle is called "active tissue" because it requires a lot of energy to maintain itself. In fact, every pound of new muscle you add to your body will burn about 60 calories per day. That can really add up. Look at the chart below:

The Fat Burning Effect of Muscle

Pounds of New Muscle	Pounds of fat burned per month	Pounds of fat burned per year
1	0.5	6
3	1.5	19
5	2.6	31
10	5.1	62
12	6.2	74
15	7.7	93
20	10.3	123

By adding just 10 pounds of muscle to your body, it will burn off 62 pounds of fat over the next year! And it will keep burning those extra calories year after year. That means that when you've lost the fat, you can eat a lot more and not gain back the fat. Also, with less fat and more muscle, your body will have the lean, toned, fit look that every man aspires to.

So by combining aerobics with strength training, you can transform your body in the shortest possible time, and keep it lean and muscular year round without starving yourself on a low-calorie diet.

More info on exercise and calories

The best cardio exercise is simply the one you will do day in and day out consistently. Choose one which you enjoy doing and don't be afraid to mix the exercises up. Interval cardio work consists of moving from one exercise to another in set time intervals. For example, you could do the elliptical trainer for 15 minutes, then switch to the stationary bike for another 15 minutes and finish off on the treadmill for the last 15 minutes. Interval training is a great way to keep everything fresh!

There are two schools of though when it comes to cardio training. The "slow & steady" group and the "high intensity" group. These two groups breakdown like this:

Slow & Steady Cardio

* Long duration (45min - 1 hour)
* Low intensity
* Burn fat and not carbs
* Preserve joints

High Intensity Cardio

* Short duration (20min - 30min)
* High intensity (interval training)
* Burn tons of calories & rev up your metabolism throughout the day
* Treat cardio like weights - explosive movements (sprinting, etc)

Our advice is to try both for at least 6 weeks and make sure to monitor your progress with a journal and take weekly photos of yourself to see if you're truly losing body fat.

Which Cardio Exercise Burns the Most Calories?
Below are the top 10 cardio exercises which burn the most calories in 30 minutes.

1. Step Aerobics - one of the most favorite cardio exercises preferred by women. Step Aerobics mainly target your legs, hips and glutes, and can burn approx. 400 calories in 30 minutes.

2. Bicycling - stationary or outdoors is a great cardio exercises, depending on resistance and speed can but 250 to 500 calories in 30 minutes.

3. Swimming - like cross-country skiing is an excellent cardio exercises as it is a full body exercises. Swimming is a great cross-training for other cardio activities. Doing the breast stroke can burn approx. 400 calories in 30 minutes.

4. Racquetball - side to side sprinting makes racquetball and excellent cardio exercises. A 145-lb person burns over 400 calories in 30 minutes.

5. Rock Climbing - is not only a cardio exercises, but also uses arm and leg strength and power. Rock Climbing can burn up to 380 calories in 30 minutes.

6. Cross-Country Skiing - whether on a machine or outdoors on snow, is an incredible cardio exercises as it involves both upper and lower body. A 145 lb person can burn approx 330 calories in 30 minutes.

7. Running - Running is an excellent cardio exercises because all you need is a pair of quality running shoes. Running burns serious calories. A 145 LB person can easily burn 300 calories in 30 minutes.

8. Elliptical Trainer - is an excellent cardio exercises and a great way to build endurance. A 145 LB person can burn about 300 calories in 30 minutes.

9. Rowing - is both a cardio exercises as well as giving your arms an incredible workout. 145 LB person can burn about 300 calories in 30 minutes.

10. Walking - Brisk walking is a less strenuous form of cardio exercises. Walking can burn up to 180 calories in 30 minutes. Sprinting, adding hills or an incline can increase amount of calories burned.

For the real high intensity cardio people out there who love the H.I.I.T training (High Intensity Interval Training), below are the top three cardio exercise which will provide amazing results!

1. Jumping Rope - This is one of the simplest, yet most effective exercises one can do. In just 15 to 20 minutes, jumping rope will give you an unparalleled total body workout. Jumping rope is ideal for cardiovascular endurance and enhances performance in virtually any sport - tennis, basketball, football, skiing, volleyball and more. This simple exercise is also great for eye-hand coordination, lateral movement, foot and hand speed and agility.

2. Sprinting - Sprinting not only burns HUGE amounts of calories while sprinting, it also keeps your metabolism flying for days after. Sprinting combined with running / jogging can bring amazing results

3. Spinning - These high-intensity workouts to music simulate a challenging bike ride, complete with hills, valleys and varying speeds, all dictated by the group instructor.