Exercise after bariatric surgery:

After your clinician approves it, we encourage you to participate in cardiovascular exercise and weight training.  A combination of aerobic activities like walking, biking, or water aerobics along with strength training has been shown to have many health benefits, including weight loss. Try to aim for at least 30 minutes of moderate activity most days of the week or 250 min/week or 10,000 steps per day (measure with a pedometer)

Ideas for starting an exercise program can be found Active At Any Size