1960s: Metronome pendulum swings back and forth. Man steps up on platform and back down. Man walks on treadmill while attached to monitoring equipment.
1960s: Metronome pendulum swings back and forth. Man steps up on platform and back down. Man walks on treadmill while attached to monitoring equipment.
1960s: Metronome pendulum swings back and forth. Man steps up on platform and back down. Man walks on treadmill while attached to monitoring equipment.