Your knees pop, grind, and ache while climbing stairs or after prolonged sitting.

And he stood up, knees popping like Rice Krispies.

She rose, her knees popping, and burped again.

I stood up and felt my knees pop.

She got up to pace as she talked, feeling her knees pop and crackle as she stretched.

He got to his feet, using the table for support and grimacing when one knee popped loudly.

He crawled out, stood up slowly, his knees popping loudly.

About three weeks later, his knee suddenly popped in training when executing a takedown.

His stride was quick and jerky and his knees continuously popped the cardboard sign up in the air.

Then he stood up, his knees popping, and shone the light ahead along what looked to be an endless tunnel.