Supta vajrasana is a variation of vajrasana and is an excellent pose for improving flexibility.
Supta matsyendrasana, a variation of the seated pose, matsyendrasana, is performed lying down on the mat. Unlike matsyendrasana, supta matsyendrasana is easy to perform and is also effective in relieving physical stress.
Supta padangusthasana is a variation of padangusthasana, a standing yoga pose. Supta padangusthasana is performed lying down on the mat and helps stretch the legs and hips.
Supta baddha konasana, a preparatory pose, is a variation of baddha konasana. Simple to perform, the pose is effective in preparing the body for certain yoga poses including seated and standing poses.
Other poses with supta in their names include supta kurmasana, supta kapotasana and supta paschimottanasana.