On average, a 155-pound person burns 42 calories while sitting for 30 minutes, according to Harvard Medical School. The number of calories burned varies based on weight and activities conducted while sitting.
An average 150-pound person burns approximately 0.20 calories per regular sit-up. According to FitClick, an average person burns 6 calories per minute of regular sit-ups, and Top End Sports says the average reasonably fit person can complete roughly 30 sit-ups per minute.
The number of calories burned while walking depends on the weight of the person and the distance traversed. According to About.com's medical review board, the average energy expenditure per mile of walking is 100 calories per mile for a 180-pound person and 65 calories for a 120-pound person.
According to All About Abs, doing 100 sit-ups burns 10-15 calories. This estimation considers a 150 pound person performing 30 sit-ups per minute for just over 3 minutes. Increasing the intensity and speed of the sit-ups to 100 in 2 minutes results in the same calorie burn in less time.
According to Diet Health Club, the average person can burn 100 calories in about 1,000 regular sit-ups. That number can be increased by doing high-intensity sit-ups: However, Diet Health Club states that it is impossible to burn more than 270 calories in any half-hour session of sit-ups.
A person burns roughly 50 percent more calories standing than sitting, reports KVAL.com. An average person burns 107 calories per hour sitting. Results vary by size and metabolism, but a 155-pound person burns about 50 calories more per hour when standing.
Based on a 150-pound person, 30 minutes of moderate-speed walking burns about 160 calories. This figure varies depending on the person's weight and his total speed; a 125-pound person burns about 135 calories in 30 minutes walking 4 mph, whereas a 185-pound person burns about 200 calories.
Walking at a pace of 3.5 miles per hour usually burns between 314 and 469 calories an hour. The exact amount depends on the weight of the person and the terrain covered.
The number of calories burned per mile of walking depends on the speed of the walk and the weight of the walker. The faster the walker is going and the more the walker weighs, the more calories she burns per hour.
A 180-pound person burns about 200 calories when walking 2 miles. A 120-pound person burns approximately 130 calories walking the same distance. The number of calories burned by walking depends primarily on the weight of the walker, according to About Health.