A Cambridge University mathematics professor has shared a simple, science-backed method for opening stubborn jar lids. Hannah Fry, in a TikTok video, demonstrated the technique, which she describes as 'brains over brawn' and 'breath over biceps'.
Fry explained that the key is to take a deep breath in, hold it, and then forcibly exhale while twisting the lid. This action, she says, increases pressure in the torso, turning it into a stiff cylinder that provides a stable base of support. The forced exhale engages the internal obliques and transverse abdominis muscles, which counter the twisting motion required to open the jar.
The professor compared the method to techniques used by weightlifters, noting that it is something people instinctively do during strenuous activities. She added that the arm alone is a 'floppy little noodle' and needs a stable torso to generate sufficient force.
Viewers of the video reported success with the technique. One commented, 'I always do the breathe out method and it really works. Now I know the reason that’s cool.' Another noted the similarity to the Valsalva breathing used in weightlifting, where breath is held to brace against a lifting belt.
