PowerLift is a computer vision system that helps powerlifters improve their technique in squats, bench presses, and deadlifts. It uses YOLOv8 to track the barbell and MoveNet to track body movements, with Extended Kalman Filtering for accuracy. The system provides real-time feedback by highlighting form issues like knee valgus, spinal misalignment, and poor bar path. After each lift, it produces an annotated video, a radar chart of biomechanical efficiency, and an overall form score. Using a Multiclass SVM, PowerLift accurately detects errors and classifies movements, making high-quality coaching accessible for lifters to improve performance and prevent injuries.