PORT ST. LUCIE, Fla. — It was still dark when Dan Warthen emerged from the Mets’ spring training complex around 6:45 a.m. Tuesday. He wore a track suit and sneakers and had a Fitbit watch on his right hand. Spring training was winding down, and Warthen thought he should spend his morning walk picking up a treat for the coaches’ room, something that everyone would enjoy.

“Today I’m going to go to Walmart,” he said. “I’ve got to get some Oreos.”

For the 63-year-old Warthen, the Mets’ veteran pitching coach and a baseball lifer, the walks have long been an essential part of his routine. During the regular season, when the Mets are on the road, Warthen will spend an hour or more strolling around whatever city the Mets are playing in. He will do it to exercise, to relax, to get lost in his thoughts.

Usually, the scenery is more impressive than it was here the other day. When the Mets are playing the Nationals in Washington, Warthen likes to walk past the White House, the various monuments and a popular fish market. He strolls along Lake Michigan in Chicago and visits Elysian Park in Los Angeles. The hilly streets of San Francisco make for a good challenge. He takes some of his longest walks in Denver’s high altitude.