They acquire stock from word of mouth through running clubs, shops and runners themselves, and most items arrive in very good condition, she adds. “Our aim is to keep items in use, so we make an effort to put as much as we can out for sale. We’ll clean, de-bobble, upcycle and repair garments.”

Given that many activewear items will re-live us and our children, they have many years of wear in them, Charlotte says. “Give second hand activewear a try. Prolonging the life of a piece of clothing by just nine months reduces its waste, water and carbon footprint by 20–30%.”

Black leggings and the outerwear brand Karrimor are endlessly popular on ReRun, followed by anything by Nike and Adidas. “ReRun has grown consistently and steadily,” adds Charlotte. “The timing is right and there are many runners and outdoor enthusiasts who appreciate being able to buy second hand sports clothes.”

She points to Worn Wear by Patagonia, The North Face renewed, Revivo by Vivibarefoot, Beyond Retro and Play it Again Sport in Wales, as other great initiatives working to extend the life of sportswear, as well as the regular second platforms including Facebook Marketplace and Ebay.

Sustainable activewear: “I found high-quality, lightly-used gym kit from these second-hand retailers”