Cube

[Paul chef]

I have a cube ltd pro hard tail and would like to put a crank/middrive on it I'm a total newbie to pedalecs but would like something with a decent bit of omph in it as I'm a large guy
Do these motors kick in when you peddle? As I've seen throttles mentioned a few times , I don't really want a twist and go as I need the peddle exercise but need a helping hand on hills
What would you suggest ?
Thanks in advance
Paul