Competitors in one of the biggest running events in Wales' face disqualification if they're seen dropping litter, after organisers implemented new rules.
Conway Half Marathon is the largest event of its kind in North Wales, with more than 3,000 runners taking past last year.
However, Run Wales have now asked participants to be "mindful and respect local residents" explicitly asking people to refrain from dropping or throwing bottle or energy gels.
"Do not throw your bottle, energy gels in gardens [or] over walls," they told runners ahead of the race. "Where possible leave your litter at the nearest water station or with the nearest marshal where a bin is not available.
"Runners will be disqualified and taken off the results if seen discarding their rubbish outside of a water stop or not with a marshal. Plastic and its use is an increasing problem."
"If I ever take a water bottles in a road race I chuck them in the big bins they usually have just after the water stops," he adds.
Lee Davitt, founder of Clwb Rhedeg DVT Running Club, which provided sweets to runners at the event, said it was a "great idea" and that "more races should take note and follow suit".
"Something has to be done and I believe this is a step in the right direction. To make this work race organisations need to put more waste disposal points along the route, as it's not enough to just have them at water stations."