Among the most apparent changes are the daily monitoring of hydration and readiness, which may seem like obvious steps already taken by other teams, but they are just the beginning for the Mets.

When players arrive at the team’s spring training complex here, they are asked to fill out a five-question survey on an iPad in the training room. The goal is to evaluate how they slept, their mood and their level of soreness, using a body chart to pinpoint the trouble spots. They also record the color of their urine; darker shades of yellow suggest poor hydration .

Before and after each spring training workout or game, players also step on a scale to find out how much water weight was lost through sweating and whether they need to rehydrate with water and other fluids to keep muscles healthy.

“More importance has been placed this year on what’s going into our bodies and what’s coming out,” said the Mets outfielder Brandon Nimmo. “It’s really good. We should be paying attention.”

Since the end of last season, the Mets have also replaced many longtime officials: their manager (Terry Collins with Mickey Callaway), most of the coaches (notably the pitching coach Dan Warthen with Dave Eiland) and the head athletic trainer (Ray Ramirez with his former assistant Brian Chicklo).

Joseph Golia, the Mets’ minor league medical coordinator, was moved up to Chicklo’s old position. A new massage therapist with a focus on deep tissue was hired. The team asked its new dietitian, Maureen Stoecklein, to spend more time around the players. The Mets added new equipment. Coaches and the training staff were more scrupulous about off-season check-ins with players by phone or in person.