1. Estimating the Total Number of Cure.fit App Users

Cure.fit, being a health and fitness startup, is quite popular among the urban population in India. Assuming that India's urban population is about 34% of 1.4 billion (about 476 million people), and the smartphone penetration among the urban population is approximately 65% (roughly 310 million smartphone users), we get a good estimate of the potential user base.

Now, not all smartphone users would be interested in fitness and thus not everyone would download Cure.fit. To estimate this, we can say about 15% of these smartphone users are interested in fitness and might have downloaded the Cure.fit app. That gives us 46.5 million Cure.fit app users.

2. Active Users

All app users won't be active. Industry standard for monthly active users (MAU) to downloaded users ratio can be around 25%. Hence, the number of active users for Cure.fit can be estimated as 25% of 46.5 million, which is approximately 11.6 million users.

3. Users Who Attend Live Classes

Not all active users will attend live classes. Some might just be using the app for tracking their exercises, diet, or might be attending the physical centers. Also, some users might prefer the recorded classes which they can take at their own convenience.

Let's assume that around 8% of the active users attend live classes on a daily basis. Therefore, the number of users attending live classes daily would be 8% of 11.6 million, which is approximately 928,000 users.

This is a guesstimate and the actual number could vary based on various other factors such as competition, user preferences, quality of the classes, and more. The idea behind such exercises is to structure your approach and think logically while breaking down a problem into smaller, more manageable parts.