A methodology and system for lysis or induction of apoptosis in cellulite and fat including directing ultrasonic energy at a multiplicity of target volumes within the region, which target volumes contain cellulite and fat, thereby to selectively lyse or induce apoptosis in the cellulite and fat in the target volumes and generally not lyse or not induce apoptosis in non-cellulite and non-fat tissue in the target volumes and computerized tracking of the multiplicity of target volumes notwithstanding movement of the body.