( CW: light mentions of knife play, cutting, hitting hand-to-hand, and choking )
So much stuff! My sadism comes from a desire to - if wanted, ofc - hurt cute people or give them discipline in ways that give them freedom from choice but can often be very much restricting, and it is usually very non-sexual (my sexuality is very different actually!)

Some of the ways I fulfill that and find my joy are: Impact play, especially with Florentine-style (two-handed) whips and floggers, knifeplay/cutting, paddling, predicament play (where moving/acting in one way or another causes different kinds of pain), pummelling, caning, breathplay/blood chokes, interrogation scenes, fearplay scenes, and even something I got a bit of infamy for back in Florida where I did a chemical invasion play scene! I've also dabbled in other things like very light fire play and slingshots - and honestly a bunch of other stuff really - but they aren't my speciality.

I have a LOT of specific fun stories, and feel free to pry sometimes if you wanna know more, but for the sake of keeping this answer out of novel level word count I'll keep that to explaining later :P