I like to do the things jim had illustrated
here, with a ball. I put 12lb weights on my hips to make it more challenging. Doing the
hip thrusts with a 16lb med ball on my hip also.
You should think about adding a ball to your equip list, you can do lots of (in)stability stuff that will work more muscles than the ones you are actually focusing on, kwim? Even just a standing on a little squishy mat while you do stuff, and/or balancing on one foot helps with this.
Oh, another thing... try leaping several feet, from one foot to the other and holding for several seconds upon landing. Repeat.