As the player starts running, press the ↑ button at the right time before the bar to jump.
If it is too early, it will fail. If it is too late, you will not be able to jump and you will fail.
If it starts from 1.8 m and succeeds, it will increase by 5 cm. From 2.15 m, it will be 1 cm higher.
The point of view can be changed with a stick.