The activation cog and disengage spring. You squeeze the red lever when you're up to speed. All day long. Just don't squeeze the red lever. If you can do a good ramp jump, you can.
Some skill is involved.
The spring offsets the rider's weight to assist in the jump. What if the rider isn't going fast enough to jump. Then it feels like you rode up and over a big speed bump. No ramp is necessary. Such as when a pole vaulter changes his speed into height.