"should I also be working my inner and outer thighs?"
Definitely. The hip adductors/abductors are secondary stabilizers to the bigger quads/hamstrings, so they should be worked too.
Outside hip (Hip Abductors):
1. You can do lateral (side) lunges/stretches for the outside thighs. (
http://latinafitness.com/resource/tr...l-lunge-sm.jpg)
2. Lay on your side and raise your top leg towards the ceiling (
http://www.sparks.org/hwdb/images/hw...e/nr551589.jpg)
3. Standing: (
http://a820.g.akamai.net/f/820/822/1...c/039b_125.jpg)
4. With a fitness ball/chair: (
http://www.firstpath.com/images/leglift.jpg)
5. "Fire Hydrants" - kneel on all fours and lift your leg to the side like a dog peeing on a hydrant (
http://www.prevention.com/images/cma/8ffd6b.jpg)
Inner thighs (Hip Adductors):
1. lay down on the side lifting the (lower) leg up.
(
http://a820.g.akamai.net/f/820/822/1.../side_lift.jpg)
(
http://www.frameofmindonline.net/pho...nner_thigh.jpg)
2. Use a thigh-master (one of those spring-loaded things you squeeze between your legs)
3. Or, use a sofa cushion/pillow between your legs and squeeze
4. Sit butterfly style (
http://www.prevention.com/images/cma...ezestretch.gif) and put your arms on your knees. Use your arms to resist while squeezing your legs up/closed.
5. With a yoga ball (
http://www.tinajuanfitness.info/exer...0on%20ball.htm)
6. Yoga ball lift (
http://www.netfit.co.uk/hip2.htm)
Those are all the ones I can think of off the top of my head that you can do at home.
--Janis