🧪 Fitness Rehabilitation Simulation

This simulation guides a virtual patient through a shoulder-abduction rehabilitation exercise performed against an elastic resistance band. A physically grounded pendulum-and-Hooke's-law model drives the arm toward a smoothly sweeping target angle while gravity, band tension and a patient-strength ceiling all fight to hold it back — exactly the forces a real physical-therapy patient contends with. Adjust the resistance band level, prescribed range of motion, rep cadence and patient strength to see how each changes the joint-angle trace, band tension, rep count and a live movement-quality score, then read the "How it works" panel for the governing torque-balance equations.