Concrete and cement are not interchangeable terms. Cement is the dry powdered substance that is mixed with sand, gravel and water to create concrete. The gravel component in concrete is sometimes referred to as crushed rock or aggregate. Mixing sand, gravel, water and cement in the right proportion is essential to producing durable, high-quality concrete.
Know the numbers. In order to lose one pound, you will need to burn 3,500 more calories than you consume in a day. How many calories you burn in a given day just by existing will depend on your current weight and level of physical activity. You can calculate this by multiplying your weight by ten.
You can lose a pound of weight if you have a calorie deficit -- achieved by exercise or cutting calories -- of about 3,500 calories. 1  A 150-pound person will burn about 100 calories per mile of running. So, if that person runs 15 miles and is able to cut 2,000 calories over the course of a week, he can lose a pound. But the same could be said if that person ran 12 miles and cut 2,300 calories.