If the seated meditation/pranayama postures are not suitable for you, you may chose to sit in a chair for all meditations and pranayama classes. You should choose a straight, hard backed chair, similar to a dining room or kitchen chair (in fact, you might just want to grab a chair from your kitchen/dining area). A straight backed chair will keep your spine erect and your posture correct for meditation and pranayama; if you sit in a soft chair, such as a living room chair, your spine will slump - this is not ideal for keeping a full breath or a clear mind in either meditation or pranayama.
Alternatively, if you still wish to try a seated posture, you may sit against a wall for support. The idea is to have as much spinal support as possible.
