Throughout our relationship she's always been indifferent to fitness, saying "oh I haven't worked out in ages" in a self-mocking tone. Just today, however, we're snapchatting and I notice she changed into a sports bra and yoga pants. I ask and she says she's going to the gym. This has never happened before. So she said she had to go and now I'm here wondering what's going on.

I guess to be fair, a few weeks ago I dropped that I went to the campus gym for the first time. I'm thus uncertain as to whether this is pure dread or if she just wants to mimic my level of interest in fitness. I'm also uncertain as to how I should react. Should I congratulate her? Make no comment? I don't know. I really hope I'm just overreacting.