Answer may be:

If you are a beginner in yoga start by practicing once or twice a week for 30 minutes. Don't exert your body and gradually increase the time of practice as your body allows.

Yoga is not something that gives you instant transformation, but with regular practice, one can achieve desired results.

Take frequent rest and modify asanas which are difficult, according to your limits.

Listen to the signals and slow down whenever required.

Once you are comfortable, you can challenge your limits and go with the flow. Remember consistency is the key and make it a daily activity for best results.