Which Les Mills classes, how often, best combo?

Whatever you like! I've only done Bodypump classes but got bored after a while, plus I'd rather work on muscle strength than endurance at this point.

I like Combat a lot but I've only done the DVDs. The classes scare me a little bit, not gonna lie, plus I burn more calories on the treadmill at this point anyway.

I used to love LM classes and typically at my old gym I would do 2 or 3 Body Pump a week and 1 or 2 Body Combat, plus 1 session of Balance when they offered it and yoga when when they stopped. Towards the end of my membership there they started offering Attack but I wasn't keen.

I missed both Pump and Combat when I joined another gym that didn't offer LM classes. But after a while doing different things there (boot camp type classes, weights/bodyweight circuits on my own, and treadmill running), I got a bit bored when I went back to a couple of Pump classes as a one off. Not sure why, I think I've got used to circuit/crossfit style classes now rather than choreography/knowing what comes next, and I've discovered that I can push myself to work harder on my own than I thought I could. I also found that a niggly lower back problem vastly improved when I stopped doing 3 x Body Pump a week - maybe a coincidence but I'm convinced that doing so many reps during the back track was putting a little too much strain on one of my discs (that's just me though).

Basically, if you love LM then keep doing the classes, but don't be afraid to try other things as well because you might just find something you like even better (and keep good form and look after your back )