Calum Jarvis made his national breakthrough as a backstroke swimmer, finishing fifth over 200m Backstroke at the 2010 British Champs then improving to fourth in Manchester the following season.
At the London 2012 Olympic Trials at the Aquatics Centre, Jarvis landed his first British title, setting a personal best for gold in the 200m Backstroke but narrowly missing the qualification time to swim at the Olympics.
After a debut senior international appearance for Great Britain at the 2012 European Short Course Championships in Chartres, Jarvis made two more finals at the 2013 British Champs, finishing sixth over 200m Freestyle and fifth over 200m Backstroke.
Jarvis qualified for his debut Commonwealth Games at the 2014 British Championships in Glasgow, impressing to set a Welsh record for fourth in the 100m Freestyle and winning his second British medal with silver over 200m Free.
He sprung a surprise to land 200m Freestyle bronze at Glasgow 2014, breaking David Davies' welsh record in the final to seal his first senior international medal.