Patients in the exercise group will perform interval training 3 days per week.
Behavioral: High intensity interval exercise
Patients in the exercise group will perform interval training (HIIT) 3 days per week, with each session consisting of four, 4-min intervals at 85-90% peak heart rate (PHR), separated by 3 min at 50% PHR. Each training session will begin with a 10-minute warm-up at 50% of PHR and end with a 5-min cool down at 50% PHR. Patients will undergo 2 initial training sessions at the exercise physiology core lab. All exercise will consist of stationary cycling to avoid discomfort associated with abdominal surgery as well as stress to the incision and help reduce fall risk. Study investigators will check in weekly with participants and remotely track exercise data and compliance via the Fitbit app.