Final answer:
An aide can assist patients with exercises and activities under the supervision of a PTA, as per California laws and regulations.
Step-by-step explanation:
According to California laws and regulations, a patient-related task that an aide can perform under the supervision of a PTA (Physical Therapy Assistant) is assisting patients with exercises and activities as directed by the PTA. This can include providing guidance and support to patients during therapy sessions, helping them with mobility exercises, and ensuring their safety throughout the process.