when to tell a friend to be quiet

(Florida)

I have a friend who has been working out for several years now. My problem is that whenever I talk to her I have to hear how she’s coming from the gym, going to the gym, just took a spinning class, etc, etc, etc. I have worked out for years and have never brought it up to anyone. I figure no one really cares. Kinda like taking out the trash…one of those things you have to do but don’t talk to everyone about. And it isn’t like she’s a size 2 or anything. She’s down to a 14, and used to be really big. I’m very proud of her, but I can’t take hearing about her workouts much longer without blowing up. I certainly don’t want to ruin a friendship over something this petty, but she’s driving me crazy!!!!!!!!!!