Standing desk
Sitting at my desk, bent over my laptop, my back started to get sore. I stood up and reached behind me to pull the wheeled chair to the side. Then I grabbed the handle of the crank sticking out from underneath the desktop and spun it around. The crankshaft made squeaking noises as it revolved. The desktop raised slowly until it was level with my lower ribs. Then I let go of the crank, placed my fingers back on the keys, and resumed working.