Decathlon can fulfill almost all of your sports needs. Running shoes, swimsuits, yoga mats, skiing gear, tents, climbing shoes, and much more, all at reasonable prices. I’ve put the info of the two closest stores to the GK area below.
Wiebachstraat 75, Kerkrade, NL
Kolenmijn Limburg-Maaslaan 3, Maasmechelen, BE