Longest duration of backward bending of thumb by a child
The record for the backward bending of the thumb for the longest duration was set by Sera Toji (born on December 3, 2010) of Thrissur Kerala. She held her thumb bending it backwards for 26 minutes and 3 seconds at the age of 11 years, 10 months and 15 days, as confirmed on October 18, 2022.