I'm too lazy to work out now, but here's what I used to do for my butt and thighs...
Get down on your hands and knees, with your back straight. Squeeze your butt muscles while you extend one leg straight backwards so it's in line with your back, and hold it for 5 full seconds, and slowly bring it back down. Repeat with the other leg, and keep repeating until you can't do it anymore
Then do the same thing but hold each leg out sideways (still bent).
Another one that really works your inner thighs and quads:
Sit against a wall with your back straight and your legs straight out in front of you. Lift one leg a couple of inches off the ground, hold for 5 seconds, swing it out as far as you can, hold for 5 seconds, swing back in front, hold for 5 seconds, and let it down.
And lunges are also great for butt and thighs!