Note that these are not traditional kettle bell swings. Don't throw a lot of weight around here. Pick a weight that you can do sets of 25 with. I mix up the order every other day or so with Front, Side, and Rear swings. Use a light balanced stance that allows you to be stable during the full range of motion for the swing. If you have to lift your heels a lot you are probably using too heavy weight.
I could do these every day and have full recovery, since I'm not going to failure or really stressing the muscle that much. YMMV.