One interesting way to add a variation to kettlebell swings is to make them band-resisted.
I've heard of these before but this video - at 2:14 - makes it very clear how to set up the exercise.
You already need to be explosive on a swing, and the band makes it more so - you must snap your hips at the bottom or you won't get it all the way up. You can't "lift" the kettlebell through the band-added resistance; you need momentum to get places. The downwards wing is also loaded, so you have to decelerate the kettlebell even more than before. Fun stuff, but tricky! Try a lighter kettlebell and a small band at first.
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