Post-surgery day 1 — walking the ward prevents clots, pneumonia, and ileus. Preoperative (assess — cardiac/pulmonary risk; optimize — anemia, diabetes, smoking; consent — informed; NPO — 6h solids, 2h liquids; prophylaxis — antibiotics, DVT): fitness for surgery. Postoperative (vitals, pain control, fluids — crystalloids; early mobilization — prevents DVT/atelectasis/ileus; DVT prophylaxis — heparin + stockings; wound care; ERAS — early feeding/mobilization): complications — fever (wind — atelectasis; water — UTI; wound — SSI; walking — DVT; wonder drugs). Fluids (maintenance — Holliday-Segar; resuscitation — balanced crystalloids; monitor — urine output, electrolytes). The walking patient recovers — immobility is the complication.