There’s substantial evidence showing that the more exercises and pre-rehabilitation you do before a surgery, the better the outcomes will be.
It’s like improving the soil before you plant the seed.
A recent study shows this is also true for digestive cancers.
“Prehabilitation reduces postoperative complications and improves short-term physical function in digestive surgery patients, with good patient acceptance; however, the long-term effects are unknown due to a lack of follow-up data.”