Police are investigating an assault that occurred at the Sheepmount Athletics Club in Carlisle.
The assault occurred on a path which leads to the football pitches at the back of the complex on 26 January at approximately 10am.
A Cumbria Police spokesman said: “The victim, a man in his 20s, sustained facial injuries.
“A 24-year old man, from Carlisle, was arrested on suspicion of assault at the scene and is released under investigation.
“Officers would like to speak to anyone who witnessed the incident.”
Anyone with information is asked to contact police on 101, quoting incident number 88 of 26 January. Alternatively you can contact Crimestoppers, anonymously, on 0800 555 111.