Saucha is cleanliness, Santosha is contentment, and the third of the Niyamas is TAPAS, self-discipline. Yoga is a discipline, and many people prefer not to look at that. You only receive the benefits from the yoga practice if you do it!! So, yes, it takes self-discipline to set up time for your routine. It is said that if you haven’t got time in your busy day for a half-an-hour yoga practice, then you should do an hour!
Exercising our bodies, eating nutritious food, meditating, having a healthy daily routine would all fall under this Niyama. It is a big ‘do’.