I'm currently researching a way to build a punch imitation (for boxing training) and for this i need a simple, fast (if it can be configurable great) and long linear motion which can handle a resistance (if the punch land on someone's face).
The things that I found which are similar to what I'm looking for are: solenoid (which, from what I heard have limitation when it comes to size) and a linear actuator (which is kind of slow from what I saw in couple of videos).
I'm really inexperienced when it comes to physics and hardware, so I need some kind of advice on what tools to research (mechanic parts and hardware) and for what to look for in general. Any help will be appreciated!