Kristaps Porzingis started off like “the Unicorn” in his first two seasons. Then he faded into mortality in the final months, largely because of fatigue or physical ailments.

So in an effort to rectify these issues, Porzingis said he traveled to Spain in the offseason to undergo an examination that sounds more like a scene in a science-fiction flick.

“I was like a rabbit,” he said. “I was doing all kinds of stuff. Running all day. They were killing me, putting things on (my chest), taking blood.”

Here’s what the Spanish doctors determined, according to Porzingis: he needs to cease “overtraining.”

“Like not coming in super early in the morning after a game to get a workout in,” Porzingis said Sunday. “That doesn’t help my weight, either. I keep losing weight. Those things add up and by the end of the season, I’m drained.

“The doctor said it too. My resistance is good. I don’t need to be running 10 miles a day. …I was always doing too much.”

In addition to being the tallest player in the NBA at 7-3, Porzingis possesses a wiry frame that leaves him vulnerable to stronger opponents with a lower center of gravity. The 22-year-old was also diagnosed with anemia, a blood condition that he attributed to drops in energy earlier in his life before taking pills to balance out his iron levels.

As a rookie two seasons ago, Porzingis was in a neck-and-neck race with Karl Anthony-Towns for Rookie of the Year until declining in the second half of the season and missing the final seven games with a shoulder injury.