Hi, I think there are three different types of spin entry...

1. Accidental Spin Entry. (Hope it never happens.)
2. Simulated Accidental Spin Entry (as in Instructed Training.)
3. Deliberate Spin Entry, for aerobatic contests.

In the first cases the cause creeps up on you, maybe unnoticed... You may
not be looking at the yaw string of ASI at the right time, or perhaps you
fly into adverse atmospheric conditions.

In the aerobatic case the entry is more deliberate, and quick. With points
awarded for the neatness of the manoeuvre and the recovery.

I remember one (aerobatic trained) instructor trying to flick roll my
benign aircraft into an un-usual attitude, but I don't think he managed it,
as the recovery was a bit too easy.