New idea to old abs work out. Bridge and scissor crunch. Works back, legs, butt, arms and abs! Almost perfect for brides looking to lose weight. 5 reps each side and 3 sets, work up the amount of reps each time.
If you feel self-conscious about having really skinny legs, you need to do some training to bulk them up. This infographic features 19 exercises you can do to take your legs up a few sizes. A Skinny Person's Guide to Gaining Weight