POP-UP: a Single-arm, Two-cohort Study: Trimodal Prehab for Upper GI and Pancreatic Cancer

"Cohort 1 - Prehabilitation program will be implemented during the last cycles of neoadjuvant chemotherapy (cycle 5 - cycle 6 or cycle 6 - cycle 8) and the weeks preceding surgery (planned 3-4 weeks after the last chemotherapy cycle)~Cohort 2 - Prehabilitation program will be implemented during the last cycles of neoadjuvant chemotherapy (cycle 2 - cycle 4) and the weeks preceding surgery (planned 3-4 weeks after the last chemotherapy cycle)"