kaitikat,
Sorry it was vague think about being on the floor on your knees & elbows (on all fours). And kick your legs back, like doing a backwards karate kick. Or you can do leg lifts, by keeping your leg straight, or you can bend your leg (so it looks like an L) and lift them up.
Pictures would help better, check out exercise (dot) about (dot) com (take out the (dot)) for visuals