As a Yoga teacher, you will have students, who will have physical weaknesses, and will have seniors in your classes. All students, young or old will be at a different level of skill. You know the wonderful improvements Yoga brings and the health benefits it provides. As for new students and especially those with some kind of physical complaint, they may not trust Yoga totally and therefore, if you would like to keep them in your class - you have to be honest with them.
When you began Yoga can you recall how challenging Yoga was. Not just on your body but on your mental level too, and yet through perseverance you began to understand your body and mind through yoga practice; where as, any new prospective student may not feel that Yoga is for them. Be absolute sincere with your learners whilst guiding and then a few months down the road, they may be thankful for the total health benefits that they have obtain.
Suppose you have older seniors as students would it not be better for them for you to teach them a hard variation of Yoga such as, Power Yoga? Perhaps, they may enjoy it but it could be something they will find strenuous and not appreciate. Have you ever considered Chair Yoga?
A number of instructors would not make use of adaptation, using supports, or even consider tailoring a Yoga class in the direction of their learners.
If, this is you, then I doubt that you would enjoy this field.
I mention this since there be a huge requirement for Yoga instructor's who have the persistence, the imaginative, combine with empathy and really wish for the betterment of others, and therefore would like to persist with their schooling as vital for Yoga instructors Job as part of Chair Yoga teaching.
The result of Chair Yoga is it will benefit your students by strengthening their abdomen, and deepen their breath. These exercises are great for your senior students and those who have limited mobility as they can be practised in almost any location including an office or any sitting location sitting.