You might want to rephrase your question, but to lose one pound, you must lose one pound. Every 3500 calories is one pound.
3500 to lose one pound and 3500 to gain one pound
To lose fat you must work on the whole body unfortunately you cant spot reduce when it comes to fat but for the answer to the question you would need to do 1000 situps a day to lose one pound of fat not counting what you took in that day.
5 situps burns one calorie.
To lose half a pound you would have to do about 225 lunges and to lose 1 pound you would have to do about 450 lunges. If you do them correctly this would be true.
453.6g per pound
To lose one pound of fat, you have to burn about 3500 calories. Situps burn about 430 calories an hour is your weight is 130 pounds, and about 560 calories and hour if you weigh around 155 pounds. Going by these figures, it will take approximately eight hours of doing sit-ups to lost one pound of fat. As you can see by this example, the mount of time it would take doing sit-ups to lose one pound of fat will vary from person to person depending on their weight.
One pound of fat is equal to about 3,500 calories no matter what your current weight is. If you can burn that many (or consume that many fewer) calories in one week, you will lose a pound of fat in one week.
Calories in one poundThere are 3500 calories in a pound of human body fat (enough to survive two or three days). If you wish to lose body fat, you need to burn or lose 3500 calories to lose one pound.