The Warriors opened their training programme in January with sessions designed for new players in a sport which those who play insist requires all shapes and sizes.
Christopher Bartlett-Legge has played since he was 15 and the defensive back is entering his 12th season with the Warriors after joining as an 18-year-old.
Despite the game's reputation for big hits, reinforced by the gladiator-type protective equipment players are clad in, he was initially drawn to the game after suffering a rugby injury.
"I played rugby when I was younger and hurt my knee so looked for a sport with less contact at the time and found flag football and that's where my obsession for the sport started," said the now 29-year-old from Risca, near Newport.
Despite initially having "no idea" of the rules, the stock controller has built up such experience he also coaches the Gwent Gators flag team and fits in two American Football training sessions a week with at least three visits to the gym and time spent watching training videos.
Christopher, who also plays centre for his local rugby side, Cwmcarn United, credits American Football's ability to find a technical position for all body shapes as setting it apart from sports more traditionally found on Welsh playing fields.
"I think the biggest attraction it has against more mainstream sports is that it is a game for all sizes of people. It needs people with such a variety of body sizes to be successful.
"You could be 5"6 and nine stone - or 6"6 and 20 stone - and both be just as valued."
Lois McConville - like Christopher - is a defensive back who had little knowledge of the game when she joined the Cardiff Valkyries in February 2016, when the club was formed as Wales' first, and still, only women's American Football team.
She was inspired by her partner, who played for the Cobras, Cardiff University's American Football team who have been competing in the British university league since 1986, having fulfilled various volunteer roles.
She says: "I played netball through school, college and uni and I also do tap dancing.
"When there was a taster session for women I thought I would try it out as I had been involved with the uni' team for physio/sports massage or ball boy at games.
"I didn't really know much about the sport, and I still don't know everything, but thought I would try something new."