sentence: An older man with a long ponytail and a pair of glasses is outside kneeling near a bike. sentence: The man has a pair of blue pliers in his hand and begins fixing the chain on the bike. sentence: Once the chain is on,he begins moving the pedal and demonstrates how the chain is operating. sentence: After awhile,he stops the chain and begins to take two links out of the chain on the bike. sentence: As the chain begins to hang down,the man puts it back in the right place and begins to spin the back wheel and begins to talk when he is finished.