springboard

spring|board /spr'ɪŋbɔːrd/ (springboards)
1 [N-COUNT] N for/to n
If something is a springboard for something else, it makes it possible for that thing to happen or start.
The 1981 budget was the springboard for an economic miracle...
2 [N-COUNT]
A springboard is a flexible board from which you jump into a swimming pool or onto a piece of gymnastic equipment.