Last Saturday we practiced Koshi Nage which is a throw where the uke or "attacker" is thrown across the back or hip of the Nage who performs the technique.
My problem is that I often end up trying to make up for the lack of ability with muscle which is a VERY bad idea for me, especially when the muscles in question involve my back.
Fortunately I was only sore for one day and by Monday I was fine.
This video of some other dojo shows some of what we practiced. The Koshi Nage throws are the ones where the victim rolls across the back of the Nage.