What to text after she says she just started a new fitness class

A new class that she says is brutal but she loves is a signal of enthusiasm and of a routine she is building. She is telling you something about her energy and her schedule without being asked. Notice the word "kind of" and the word "brutal": she is self-aware and a little playful, which suggests she will respond well to light humour and to being teased gently about the difficulty, not to being told how impressive she is.

The detail also gives you a timeline. Thursdays are a fixed point in her week, and that is useful because it hints at when she is likely to be in a good mood or looking forward to something. It also means the class is a recurring thing you can ask about later, which turns a one-off mention into a running thread. People who feel listened to tend to bring up their week again, and that is the easiest route to continued conversation.

The reply has three jobs. First, respond to the actual content: the brutal part, the part she loves, or the schedule. A specific reaction shows you were paying attention and gives her a reason to keep talking. Second, ask one question that is easy and specific, something about what the class involves or what made her try it. Avoid anything that requires a long essay back. Third, make the number exchange feel like a natural next step rather than a jump. You can do this by suggesting the conversation would be easier somewhere else, or by mentioning something you would want to ask in person, such as trying a class or grabbing food after one.

Keep the number move for when she has replied with real content. If she answered your question with detail and seems to be enjoying the exchange, that is the moment. If she gave a one-word answer, the number ask will feel forced, so spend another exchange building the thread instead.

Send the reply in a window when she is likely to be free and not winding down for the night. Early evening on a weekday or a midday break tends to work better than late night, when a message can feel like an opening move with a hidden agenda. If she mentioned a Thursday class, a reply the day after or the morning of her next session gives you a natural reason to write.

If she replies within a few hours, match her pace without speeding up. If there is no answer after a day, wait another day before a single light follow-up, something short that does not reference the silence. If there is still nothing after that, stop. Two unanswered messages with no reply is a clear enough signal, and sending a third only makes the next conversation harder if she does come back later.