I have good memories of Jazzercise
I moved to a small town in 1980 after getting married. I signed up for Jazzercise classes because I'd hurt myself running and was told by my dr to give it up (running).
Our leader wasn't so over the top. The music was current top 40 fare and the "routines" were changed every 6 weeks or so. This was along the same time that Jane Fonda's workout album came out, I believe. Yes, it's corney, but it brings back fond memories for me