PORT ST. LUCIE, Fla. — When Yoenis Cespedes, the Mets’ musclebound star outfielder, begins his off-season workouts or spring training, his lower back typically stiffens. It has been a byproduct of being too tightly wound and lacking in flexibility.

“This year, I haven’t felt that,” said Cespedes, 32, of the usual back tightness.

After another year of leg injuries in 2017, Cespedes, much like the Mets as a whole did this winter with their medical and training departments, made drastic changes.

While he still trained with Mike Barwis, who oversees the organization’s strength and conditioning program from Florida, Cespedes applied three simple changes: he ran more; he lifted less; and he became more flexible, in part, with weekly yoga sessions.

“Injuries are unpredictable,” he said on Monday, the first day of full squad workouts in Mets camp. “You don’t know when they’ll happen. But what I did was better prepare myself to try and prevent them.”