Whist we have one (if we do, of course, is), but the muscles that form it, a lot.
Therefore, a lot of exercises for the waist. Here I will only discuss the most are the most common.
Exercise first. SP (starting position): stand up straight, feet shoulder width apart, arms down. At every turn through the upper part of the body (everything from the waist up) to the left, at the expense "and" return to the starting position. On account of the "two-and" doing exercise in the right direction.