The chiropractic adjustment requires a certain amount of force (or energy) to restore normal motion to a joint that has lost its normal mobility (joint dysfunction). The energy or force necessary to restore motion to a joint is a function of two factors: speed and amplitude (or depth). A good adjustment is a combination of good speed and a shallow, controlled depth or amplitude. Many "low force" adjustments lack the proper speed to correct joint dysfunction. Also, the shallow, controlled depth, along with good speed allows for a gentle, yet effective adjustment.