Noah Syndergaard adding fourth pitch to powerful repertoire

Noah Syndergaard Photo: Anthony J. CausiPORT ST. LUCIE — Noah Syndergaard might as well have been making his first start of the season Thursday.

Throwing live batting practice — with Mets minor leaguers taking swings — the fireballing righty turned heads during a 25-pitch session.

“That ball is moving two feet,” manager Terry Collins said near the batting cage, as Syndergaard strutted his stuff.

Syndergaard seemed amazed with his performance.

“Overall my body feels great,” he said. “I wish I really knew the answer to why I feel like I’m already in midseason form. I just think it’s the fact I threw so much last year and we went so much farther than a normal season or anything we’re used to.

“That…