Sorry I didn't post some adductor exercises earlier... I use a balance ball and do the following: (these might not be the best descriptions... let me know and I can explain them further)
1. Traditional sit-up position (on back, knees bent) w/ ball between legs
A. Squeeze ball tightly, pausing slightly on each compression = 10 squeezes
B. Lift hips off floor while maintaining tight squeeze on ball = 10 lifts
C. On #10lift from "B", keep hips off the floor and squeeze ball = 10 squeezes
2. Lay on back, arms straight out flat for balance, w/ ball between ankles
A. Lift legs straight into air and squeeze ball between ankles = 10 squeezes
B. Lift legs straight into air and bend at the knees, while maintaining squeeze on ball = 10 bends
C. Lift legs straight into air and while maintaining squeeze on ball, twist ball between ankles (alternate bringing each ankle sort of in front of the other, rather than parallel to each other as in the other exercises) = 10 twists each side
3. Lay on back, knees bent, arms straight out flat for balance, with ball between knees so that shins are parallel to ground (like set 1)
A. Lift feet off floor and while maintaining constant squeeze on ball, alternate tipping your knees side to side as far as you can while controlling ball and performing steady movements = 10 tips on each side
B. Lift feet off floor and while maintaining constant squeeze on ball, circle ball clockwise (keeping hips even on floor) (as you get stronger, you can extend size of circle so that you're almost straightening legs and lowering them just inches above the ground) = 10 circles
C. Same as "A" but counterclockwise = 10 circles
D. While maintaining constant squeeze on ball, bring knees toward chest till ball touches chest, and then move ball away from chest (shift bent knees forward) till heels hit the ground = 10 knees to chest/heels to floor
4. Also, small exercise bands like in the link below are very good. You can loop it around both ankles and side step to the right, and then to the left.
http://www.amazon.com/SPRI-Spri-Xerband-Kit/dp/B0009TOEMC