Final answer:
Patients undergoing heavy resistance exercises in a rehab environment typically engage in these exercises two to three times a week, depending on their treatment plan and progress.
Step-by-step explanation:
In a rehab environment, the frequency of patients undergoing heavy resistance exercises can vary depending on their specific needs and treatment plan. It is common for patients to engage in resistance exercises two to three times a week. The frequency and intensity of the exercises are typically determined by healthcare professionals, such as physical therapists or trainers, based on the patient's condition and progress.