Recs for Workout Classes/Gyms for 40+

I'm looking to get my mom a subscription or a bundle of classes to try out, but I don't want to send her anywhere with too many young people since I think it might be intimidating. She's new to fitness and I think working out with at least a few other people her age or in a similar position would be the best way to encourage her to stick with it.

I'm primarily looking for yoga or strength training places--any recommendations? Preferably in the Fort Lauderdale-Hollywood-Aventura areas. Anything strictly in Miami would be too far south, although a chain with multiple locations would probably be fine! TYIA!