Physiotherapists play two key roles in the ICU - respiratory physiotherapy and rehabilitation. For respiratory physiotherapy, they help patients clear excess sputum from their lungs through techniques like manual chest therapy, positioning, and suctioning, since patients on ventilators cannot cough normally. For rehabilitation, physiotherapists work to maintain patients' muscle strength and joint mobility through exercises and mobilization techniques to prevent long-term disability from critical illness. They also help wean patients off ventilators by regaining their respiratory muscle strength. Proper protocols around infection control and patient safety are followed during all physiotherapy sessions in the ICU.