Begin by stand behind a barbell with your feet wide and toes turned out slightly. Without rounding your back bend the knees and reach down and hold the barbell with both hands. It may be more comfortable to hold the barbell with a reverse grip (i.e. one hand palm facing inward and the other palm facing outward).
In a fluid movement press down in your heels and thrust the hips forward coming to a full upright position. Hold the standing position for one or two counts and then slowly lower back down hinging at the hips keeping the back strait and the shoulders down. Repeat for desired number of reps.