George Kittle opens up on bizarre NFL training method with sex life side effect

San Francisco 49ers tight end George Kittle might’ve shared too many details about his recovery treatment.

During a recent appearance on the “Bussin with the Boys” podcast, Kittle explained that he uses a Vasper machine to help improve his recovery — and the extra side effects it has on his testosterone levels.

“I do it a little bit during OTAs (organized team activities), but as soon as I get back in the summer, it’s like my cardio every day at the end of my workout,” Kittle, 31, said. “I’ll go lift, run my routes, run hills and then I’ll do a 20-minute Vasper session, four days a week. I love it.

“It also knocks you the f–k out at night, unconscious. You sleep so well, and you have wild dreams, too. It’s awesome … The main selling point is you, um, blow huge loads.”

Warning: Graphic language

This video is wild 💀

George Kittle talks about using a Vasper System for his training:

“It knocks you the fuck out at night. You sleep so well and you have wild dreams. The main selling point is that you blow huge loads… That’s how it was sold to players that it boosts your… pic.twitter.com/cU9iGjMocF

— Coach Yac 🗣 (@Coach_Yac) June 24, 2025

The Vasper System is a recovery bike that utilizes blood flow restriction (BFR) and uses compression technology, liquid cooling and interval training to “create the effect of a high intensity (anaerobic) exercise without the wear and tear, time, effort or stress it takes to achieve the same results with conventional exercise,” according to the company’s website.

“I was like, ‘How do I say it?’ I just gotta say it,” Kittle continued regarding the sexual side effects.

“That’s how it was sold to players. It was like, ‘Look, it boosts your testosterone, you sleep really well, you’re going to feel great and you also blow huge loads.”‘

Kittle — who’s been married to his wife Claire since April 2019 after meeting at the University of Iowa —  was skeptical at first.

“I was like, ‘Oh, that’s bulls–t’. Not bulls–t. And then that rumor started going around,” he said. “In 2019, there were six or seven coaches that were doing it all of the time… [like Mike LaFleur] one of my (offensive coordinator)’s, he was in there all the time, going to town.”

Kittle added that he’s “lightyears ahead” of where he was last year at this time mentally and physically after having a rare postseason off.

The 49ers failed to make the playoffs for the first time since 2020 with a 6-11 mark last season.

“The one benefit of not making the playoffs is you get an entire month off. I haven’t had January off since 2020,” he said.

“Mentally and physically, I’m lightyears ahead of where I was last year, which is pretty fun.”

Kittle signed a four-year deal worth up to $76.4 million with $40 million in guarantees with the 49ers in April, tying him to the team through the 2029 season.

He tallied 78 catches for 1,106 yards and eight touchdowns in 2024, becoming the fifth tight end in NFL history to record at least four 1,000-yard seasons.

Veterans report to 49ers training camp on July 22.

San Francisco opens the 2025 season against the Seahawks in Seattle on Sept. 7.