Erika Rischko does stomach presses in Leichtlingen, Germany.
Since then, Rischko has uploaded more than 100 videos of herself doing exercises like planks and pull-ups, as well as dancing, to encourage others to remain active during lockdown.
"Move and do something! Don't just sit in a corner and mope. That's just the worst," she told reporters.
She has amassed around 125,000 followers and more than 2 million likes on the TikTok app, which is hugely popular among teenagers and is best known for dance and lip-syncing routines and viral challenges.
In some of her clips, which her daughter shoots for her, she trains by herself and takes on fitness challenges set by people who are decades younger than her.
In others, she and her husband, whom she met in a dancing event years ago, do synchronized dance routines.
Rischko said she was especially encouraged by the comments that young people post in the app, cheering her on.
"I'm really happy. I've never been as self-confident as I am now," she said.
From the neck up, Johanna looks like the typical great-grandmother with her poof of short, white hair and oval glasses. But from the neck down, this 94-year-old is an elite athlete.
From angling your arms at 90 degrees to focusing on your breathing, here's everything you need to know about performing the perfect plank.
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