It's pretty impressive when someone can do a backflip off the high dive, but it's even more impressive when they can do it at age 91.
John Carter is a 91-year-old man from British Columbia, Canada, who is making headlines as the "world's most extreme grandpa" after a YouTube video in which he stars has gone viral.
According to CBC News, the viral video features Carter doing backflips off a 10-foot-tall diving board into a swimming pool, a regular part of his weekly routine.
A couple of times, Carter has lost his dentures performing the stunt.
"I thought they were closed in good in my pocket, but the lifeguard says, 'Hey, Mr. Carter, your teeth are down by the bottom of the pool,'" Carter said in the video, which was made by his granddaughter's husband.
Watch the video here.
also shows Carter running, snowshoeing, riding his bike and playing soccer — activities that are all quite unusual for a 91-year-old man.
"Very often I'm awake at 5 a.m. and then I get up and I put on my walking shoes and nothing seems to slow me down," Carter said.
CBC News reported that even though he is in his 90s, Carter says he feels more like he is 65 or 75 years old.
"Being active has been a part of my whole life. I just never quit so I never got old," Carter said, according to Pickle. "My motivation is to live a long and healthy life."
Carter has never smoked or drunk alcohol and has recently started to limit his meat-eating because of his dentures, per CBC News.