Crunch and Click

I hopped onto the entryway mat and immediately heard an annoying little grind in my right knee. A few stubborn grains of sand from earlier had hitched a ride inside the hinge! No way I was letting that slow me down. I sat flat on the textured mat, pulled my knee up, and gave the joint a sharp tap against my palm. A tiny sprinkle of grit spilled out onto the bristles below. Two quick test-bends—snap, snap—smooth and silent again. Ready for whatever's next!