It was described as a 'v-e-rrry hot day' in fashionable snow resort Sheregesh as 700 women and men (in swim suits) smashed the world record.
This is a fun way to stay fit and raise a healthy child, say supporters.
Pictures show 1,835 men, women and children 'smash record' in the Siberian sun.
The successful bid was at one of Siberia's most popular winter sports resorts - Sheregesh.
These extraordinary pictures give graphic new evidence of climate change.