Physical punishments can be divided in two groups. First is so-called impact-play, that is everything around spanking, caning, flogging, whipping, etc. There will be plenty of opportunities to talk about those methods.
For this post, however, I want to list some other suggestions, that are slightly softer in nature, albeit physical.
Strenuous workouts
Make your slave sweat a little bit. How long can he hold a plank? Or wall-sit? Again: so many health benefits at the same time!
Another idea: Make him stand while holding a coin against the wall with his nose, or any other object with his fingers.
Little ouchies
My favorite thing in the world is something my slave and I did even before we were formally in a Femdom relationship. Whenever he has a three day beard (sometimes I make him grow it just for this purpose), I make him lie on the sofa or bed, take out a pair of tweezers, and slowly pull out one hair after the other. It’s one of those punishments that I find extremely relaxing and soothing. For both us, actually. Give it a try!
Other ideas
Another classic is making your slave kneel on rice, little stones or legos (ouch!). You can also put them in his shoes and make him walk around town like that.
Do you have any ideas how to make your slave suffer for his bad behavior? Then leave a comment!