A weightlifter was caught on CCTV headbutting and punching another man in a "gym rage" attack.
Lyn Aylesbury broke a fellow gym-goer's nose in the assault among the dumbbells and workout machines at the Wales National Velodrome in Newport, South Wales.
A court heard how the 47-year-old had sent an angry text to former friend Andrew Ferris after the pair fell out.
Richard Ace, prosecuting, said that Aylesbury had accused Mr Ferris of "belittling him in front of others".
The tension boiled over when Mr Ferris was confronted by the burly weightlifter as he arrived at the gym to work out.