The pawanmuktasanas series essentially help to activate the blocked energy flow. They consist of three simple, systematic and harmonized asanas series (physical practices) and can be practiced by everybody. 
No matter how young or old you are, whether you are healthy or not, everybody can benefit from the pawanmuktasanas.

Pawanmuktasana series:
1. Anti-rheumatic practices to release blockages and accumulations in joints and extremities.
2. Practices to strengthen the digestive system and to release blockages.
3. Shaktibandas to release blocked energy in the pelvic floor and the spine which in turn raises vitality.

Even though most of the pawanmuktasanas are easy to practice, they cannot be regarded as only secondary or even be neglected. Even experienced practitioners are advised to include them into intense hatha yoga sequences in order to prepare the body for more demanding techniques.

Literature: Asana Pranayama Mudra Bandha