If I ran 3 miles a day for 3 weeks, with proper diet, how much weight will I los!

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Three miles a day is for three weeks is a lot .

Your body- knees, ankles- would break down.

This is why people join the ymca. I can't run every day for three weeks, but I can do different things every day. I take a 45 min bicycle (spin) class 4 times a week. I lift 3 days a week; I run on Sundays.

No one knows...how much do you weigh now, what is your physique like, height?

If you run for 3 weeks for 3 miles a day with proper dieting you could lose a healthy 10 pounds. I say healthy because anything else and you will start losing muscle. You could potentially lose over 20 pounds but I don't recommend doing that!

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You could run for 1 mile and practice healthy dieting. This would be more effective than running 3 miles. The 3 miles means your body will break down muscle and you don't want that. Stick to 1 mile but make it challenging. You could run for 1 minute>Sprint for 15 seconds>walk for 30 seconds> run for 1 minute>Sprint for 30 seconds>walk for 1 minute> and repeat.

After you finish a mile than sprint for as long as your body allows you to and that is all you need.

please mention your present weight and height for better suggestions.