The current practice to avoid incisional hernia, one of the most frequent complications following abdominal surgery, is to minimize core muscle activity in the postoperative phase. However, there is no evidence to support the association of core muscle activity and increased incidence of incisional hernia. On the contrary, it is likely that reduced physical activity could lead to physical deconditioning, chronic postsurgical pain (CPSP), and sarcopenia. The investigators will conduct a prospective multicentric randomized clinical trial to compare standard of care to core muscle exercises targeting the abdominal muscles immediately postsurgery. The principle hypothesis is that neither specific exercises of core muscles before and after surgery nor physical restriction alter the incidence of incisional hernias. Secondly the impact of postoperative rehabilitation on CPSP and sarcopenia will be assessed.