Scratch Olympics Weightlifting
Press Z & X keys alternately to give the powerlifter enough strength to raise the bar over his head. The fast you can alternate key presses the better.
This comes from a tutorial by the Raspberry Pi Foundation, & you can try it here: https://www.raspberrypi.org/learning/scratch-olympics-weightlifter/worksheet/
I added the bits that play music and add the gold medal if you win.