Traditional Ashtanga yoga, as is taught in India, follows the Mysore-style method. If you’ve ever been to a yoga class where the teacher stands at the front and calls out poses, this will feel very different.
In Mysore-style Ashtanga yoga, instead of following a teacher's verbal cues throughout the class, you learn a set of carefully sequenced poses. Everyone starts at the same place and the teacher adds one pose at a time, until each pose is integrated - thus creating our own personal practice. So during mysore mornings, you arrive at the shala, roll out your mat, and begin your own sequence. We don’t all start at the same time, and our practices are different lengths (at the beginning, it might be 30 minutes, and as your practice develops, it will become longer). So although you practice in a group setting, the sequence is fully tailored and personalised to your body, your abilities, your style - even to your wellbeing on the day. 
This also means that you are empowered to practice anytime anywhere, whether you're on holiday or on a business trip, you still can roll out your mat in the morning and do the sequence as was taught to you.