Some asanas that can help include Seated Half - Bound Lotus Pose (Ardha Baddha Padma Paschimottanasana, Half Lord Of The Fishes Pose (Ardha Matsyendrasana), and Reclined Lotus Pose (Supta Padmasana).
Supta Baddha Konasana is an excellent preparatory pose for a number of different poses, including many standing poses, Gomukhasana, Malasana, Padmasana, and most seated twists and forward bends.