if they have requested your treadmill test it will only cost you your time they pay for it, I have to retake it every 3 years since my troubles but look at it as an early warning system for as much my benefit as everybody else’s, my troubles are clogging of the arteries so no outward signs, I eat good, do not drink ( I had about 3 pints of cider during 2018 in halves) do not smoke and now the dogs passed on I do not get as much exercise but still walk about, so go and do it and be chuffed when they say how good yours is compared to the rest that struggle to climb on the machine let alone complete the test,