How long should i exercise?

I have a bike a home thing and for about 10 mins I lose 200 cals and im really overweight so how long should I go? and would it be bad if I still eat a lil junk food but still exersaize?

Just don't overdo it on the excercise - some people have such a desire to lose weight quickly that they make themselves sick.

Moderate your eating (a little junk food is ok, but remember that you'll have to reduce calories by excerise or eating less that day - not recommended)

As long as you keep at it and each day if you are able to push yourself just a little further, you'll reach your goal

My step-dad is also trying to lose weight. You need to excercise at least 30 minutes a day, and at most 1 hour and 30 minutes.
What you need to do about eating is have it balanced. DON'T just go on healthy food. You WILL lose wait fast if you do that, but you will gain it back faster. My step-dad did that once. Balance your healthy foods, with some unhealthy foods. Don't make the unhealthy foods too unhealthy. Balance your meals.
My step-dad eats a nutri-grain bar in the morning, a chicken sandwich in the after noon, and then something healthy for dinner. The next day he does something for dinner like steak. Go on stuff like that.

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How to LOSE weight?

First, determine from the information below, what your weight should be. Then set yourself goals of a week, 2 weeks, a month, 3 months, 6 months and a year. As you see yourself meeting your goals it becomes easier. Remember, you didn't gain your weight overnight so don't expect to lose if overnight. Plus, weight lost slowly is more likely to stay off than weight lost in a hurry.

BMI (Body Mass Index) is a measurement of body fat based on height and weight that applies to both men and women between the ages of 18 and 65 years.

BMI Classification

18.5 or less Underweight
18.5 to 24.99 Normal Weight
25 to 29.99 Overweight
30 to 34.99 Obesity (Class 1)
35 to 39.99 Obesity (Class 2)
40 or greater Morbid Obesity

Check out your BMI at the bmi calculator site below to see where you stand.

bmi calculator:

http://www.bmi-calculator.net/

If you need conversion info, 1 kg = 2.2 pounds and 2.54 cm = 1 inch (12 inches = 1 foot)

Info if you are trying to GAIN weight:

http://www.bmi-calculator.net/treatment/underweight-treatment.php

Info if you are trying to LOSE weight:

http://www.bmi-calculator.net/treatment/overweight-treatment.php

How can I Lose 1 pound of body weight per week?

One pound of body fat is equal to about 3500 calories. So to lose 1 pound of weight per week, you need to eat 500 calories/day LESS than you burn.

But it's not a good idea to lose weight simply by cutting calories. As well as decreasing calories you should increase your daily physical exercise. This helps to burn calories and build more lean tissue which in turn burns more calories.

What should a minimum calorie intake be?

As a guide to minimum calorie intake, the American College of Sports Medicine (ACSM) recommends that calorie levels never drop below 1200 calories per day for women or 1800 calories per day for men. Even these calorie levels are quite low.

http://www.bmi-calculator.net/bmr-calculator/harris-benedict-equation/calorie-intake-to-lose-weight.php

Normal Adult Height-Weight Range Table

http://www.recipehound.com/weight.html

Average Teenager Weight

http://lifestyle.iloveindia.com/lounge/average-teenager-weight-236.html

ok well is this ok? again im using the at home bike thing

cal eatin - 1000
excerising bike time - 20 mins
speed - 20-30
distance- 17.4
cals burned- 441

is that ok? because since im overweight igot pretty tired after that.

you should try exercising 30 minutes a day and eating healthier. try fitting in more natural fruits, vegetables, and less sugar