As you continue to burn calories but do not take enough more in, you will begin to burn off fat and lose weight. If this continues, your body will begin to starve.
When you don't get enough calories or you burn more calories than you take in, you become tired and fatigued. Another Answer: When you burn more calories than you consume, you will lose weight.
Your body stores that extra energy as fat.
When you take in more calories than you burn, the body converts the calories and adds them as fat cells. It can be terribly difficult to get the body to stop converting even when a person tries to diet, because the body can interpret the the diet as deprivation and 'starvation'.
For a 160 pound person performing situps at a moderate rate, it will take a little less than 2 hours of continuous situps to burn 500 calories. It will take less time for people who weigh more and will take longer for those who weigh less. Situps are not a great exercise for burning calories, but they can strengthen your abdominal muscles well. Compare it to running at 8 miles per minute, where the same 160 pound person can burn almost 500 calories in only 30 minutes.
Take in less calories than you burn, to lose weight, and you train for parkour by just doing it.
at-least 100-150 calories.
233 days assuming you burn 600 calories per day:* 1 lb = 3,500 calories 40 x 3,500 = 140,000 calories 140,000 / 600 = 233 days *The actual number may be less if you are working out because muscle continues to burn calories after workouts.
How long it takes to burn off 3000 calories depends on the activity you choose and your size. If you select a moderate activity that burns off 200 calories an hour, it will take you 15 hours to burn off that many calories.
There are about 3,500 calories in a pound. Burn 3,500 calories more than you take in = loose one pound. Take in 3,500 more calories than you burn = gain a pound.
I burn 910 calories in 1 hour of hard cycling according to my Garmin.
The most direct way to burn calories fast is to take in fewer calories than you burn off. Increasing activity by taking the stairs, running, doing the eliptical are all quick ways to get rid of those calories.