My issue is the lack of education on the part of the trainers. Also, a lot of women there are borderline "female athlete triad". Fitness is fantastic, and I'm all for it, but consider what happens to manual laborers when they get into their 50's...a lot of them are crippled. They push too hard, too fast, and the amount of catabolism going on can deteriorate the bones, connective tissue, and kidneys. I will admit that there is definite strength there, and a good amount of permanent muscle, however, with the duration of their sets, it's mostly hypertrophy that they're benefitting from. If they quit for too long they'll deteriorate.