Reynolds was born to a fencing family, his father was the leading Welsh fencing coach Professor Glynne S. Reynolds and his mother Jackie Reynolds was a four-times Welsh foil champion.[2] In February 1957, the family, which included three other siblings; Robert, Valerie and Frances, all emigrated to Southern Rhodesia. At the time Andrew was the Welsh national schoolboys runner-up.[3]
The family returned to Wales and Andrew was a member of the Salle Reynolds Fencing Club. He represented the 1966 Welsh team in Kingston, Jamaica, where he participated in the foil and Épée events.[4][5]
Reynolds attended his second Commonwealth Games at the 1970 British Commonwealth Games in Edinburgh. His siblings Robert and Frances also competed at the 1966 and 1970 Games.[6]