Did you download my CAPX?
The progress bar is decreased by 1 every 0.1 seconds.
You can increase the bar by 2 when the correct key is pressed.
Or, if you want a more advanced logic, you can do this:
Add Timer behavior to the running man sprite.
When your game starts, start the timer (for example for 0.5 seconds).
When the timer elapsed, decrease the bar by 1 and restart the timer.
If the correct key was pressed, stop the currently running timer, increase the bar by 1 and restart the timer.
This way if the correct key is pressed at least once every 0.5s or faster, the progress bar will increase.