There are lots of ways to improve your physical fitness before your operation, even if you are already active.
You should do an activity that makes you breathless at least three times a week (aim for a minimum of 150 minutes per week). This can include; brisk walking, cycling, gardening and swimming.
The key is to start slowly and build up your activity over time.
Watch this video by St. George's University Hospital ‘Get Set 4 Surgery’ on increasing your activity levels before surgery: