Article continues below advertisementKendall Jenner has been keeping up with her fitness.The Kardashians star, 29, looked lean as ever in skintight loungewear on Thursday, July 24.Article continues below advertisementSource: @kendalljenner/InstagramKendall Jenner showcased her toned tummy.Jenner exhibited her ripped abs in high-waisted black leggings and a cropped gray tank from Alo. Her face was not visible as she snapped a mirror selfie, solely her two-piece set and black flip flops.