@James *******
I think Crossfit might work. I know Phuket Beach Volleyball Club has real training packages for the DTV and it works. Crossfit is an actual sport. For a gym to call themselves a Crossfit gym or use the word Crossfit in their gym name they need to be registered with the worldwide governing body of Crossfit. If the gym in Thailand is a real accredited Crossfit gym then I think it could be used for the DTV in the same way beach volleyball is used cause it's a sport.
The DTV does state sports training as one of the options.
I think most people don't realise that Crossfit is an actual sport and just think of it as a normal gym