I've been in the biz since the late 80's and yes the industry is evolving and changing every yr. Planet Fitness, as much as a joke it is, has a huge hand in this. The cool thing is that mainstream population are now getting healthy. the drawback is they are almost all soft core, country club mentality atmosphere. IMO there is a direct link between the fact that gym memberships are up but so is the obesity rate. Planet Fitness with its "don't try too hard" philosphy is leading the cause.
Good luck Perfect, IIRC I was on a website that was something like GYMJOBS.com and they listed all openings in USA.