Tributes have been paid to a 27-year-old Cardiff PE teacher who has died after collapsing during a gym workout.
Matthew Price, originally from Pembrokeshire, was taken ill while running on a treadmill.
Pupils from Mr Price's school, Fitzalan High School, have left tributes on social networking websites calling him a "great teacher".
The cause of death is being investigated, including whether he had any undetected health problems.
Head teacher Cath Bradshaw said: "Mr Price was a highly respected member of staff at Fitzalan High School who always contributed fully to school life.
"He enjoyed running an after-school football team which achieved significant success in local competitions.
"Many of his colleagues also considered themselves as his friend.
"This has come as a shock to the whole school community and he will be sorely missed by all staff and pupils at Fitzalan. Our thoughts are with his family at this difficult time."
Many pupils have also left tributes on Facebook.
One wrote: "A wonderful teacher that was loved by everyone has passed away in a gym. I have never seen my whole school this upset."
Mr Price, originally from Herbrandston, played football for Cardiff side Roath Park Galaxy and coached the Heath Park Rangers under-16 team.
Galaxy club secretary Adam Jenkins said: "He was a sound guy.
"He was funny and he was always the life and soul of the party, always getting people together, just a good friend really."
He said Mr Price was one of the fittest players at the club.
"He played for us twice a week and went to the gym four or five times a week so it was a massive shock to everyone," he said.
He added there were plans for a testimonial game in Mr Price's memory between Galaxy and his former club in Pembrokeshire.
A spokeswoman for South Wales Police said: "We are treating the death as non suspicious and are preparing a file for the coroner."
A spokeswoman for Cardiff coroner's office said: "We are aware of the death and the cause of death is currently being investigated."