Adductor leg raises are an easy exercise to target the adductors.
1. Start by laying on your side with your opposite leg bent with that foot in front of your bottom leg
2. Raise the bottom leg as high as what is comfortable
3. Return to the starting position
You can make the exercise harder by propping up on your elbow or hand. If you need more of a challenge, you can place a leg weight on your leg and follow the same progression to target the adductors.