Jagr has played in all seven games this season for Kladno (4-3-0), with a goal and an assist.
He played in only 15 games and had just four assists, last season, when he said he weighed 270 pounds. Jagr dropped 30 pounds in the offseason.
"After I went to Pittsburgh last year I decided I just want to do things that make me happy," said Jagr, who had his No. 68 retired by the Pittsburgh Penguins on Feb. 18. "I lost some weight. I was weighing 270 pounds, so it was tough for me to play. I wanted to be good, but I was too heavy, I didn't even enjoy it and I was afraid I was going to get injured because I was too heavy.
"So I lost some weight. I'm at the same weight that I played at in the NHL. I don't get tired and I enjoy it a lot more than I did the last year."
The fact he's playing and running the team at the same time hasn't given Jagr much time to think about his future once he does officially hang up the skates, whenever that may be.
But if he has a future with an NHL franchise, Jagr was clear he only has one in mind: the Penguins, who he helped win back-to-back Cup championships in 1991 and 1992, the first two of his 24 seasons in the League with nine different teams.
"In Pittsburgh, I finally know where I belong," he said. "I played with so many teams and I loved every minute of that but I spent the most time and I feel that's where I belong, and I feel like I got the stamp last year when I got [my number retired]. So I feel like I'm a Pittsburgh Penguin."
Jagr played his last NHL season with the Calgary Flames in 2017-18 at the age of 45. His 1,921 points in the League (766 goals, 1,155 assists in 1,733 games) trail only Wayne Gretzky in NHL history (2,857). Jagr ranks fourth all-time in goals and games played.
He said he and the Penguins discussed a potential future role when he was there last season for his jersey retirement ceremony.
"But it would have to be something that makes me happy," Jagr said. "I don't want to do it if it doesn't make me happy. I still love the game and I feel like I always had the gift to see the game differently, that's why I could play so long.
"But I don't want to just go somewhere and give advice. I want to feel it from the other side too, that we want to hear the advice. It's got to be two-way. I don't be the policeman and say, 'Hey, you have to do this, this and this.' I don't like that because if you see somebody come for advice he knows, I know he wants to be better. Not every player is thinking that way."
One thing Jagr said is certain is he will not attempt another NHL comeback.
"I had my time, my turn and I want to say thanks to the NHL," Jagr said. "They made me what I am right now. I appreciate it. I was so lucky. I had a great run. That was a great life."
He also knows the longer he plays, the longer it will take him to get into the Hockey Hall of Fame. It's a sacrifice he's willing to make.
"That's OK," Jagr said. "I just want to do things that make me happy. Hockey makes me happy, still playing. Hopefully one day I'm going to get there."