what is the center of a trampoline called
Trampoline The fabric that users bounce on (commonly known as the "bounce mat" or "trampoline bed") is not elastic itself; the elasticity is provided by the springs that connect it to the frame, which store potential energy.
Slide (baseball) A baserunner may slide into a base in a number of different ways and for a number of perceived reasons, including to avoid a tag out, to avoid overrunning the base, and to interfere or avoid contact with the defensive player protecting the base. Adult amateur players should determine whether they will benefit by sliding in a particular game situation, and whether an increased risk of injury will make a slide worthwhile.