I sometimes wish we could delete the entire fitness industry from the world and replace it with a few lines of text, something like this: eat right, exercise, get adequate sleep, reduce stress, get variety, use natural motions, breathe deep, get yourself winded intentionally from time to time, when in doubt walk, etc. The vast majority of people probably never need to go near a fancy weight machine or even lift artificial weights of any kind. Just carrying out normal actions in the Earth's gravitational field, putting your body through all the natural ranges of motion it's capable of doing, is actually pretty darn adequate, and can build muscle and improve figure and physical capabilities. I believe most of the industry is not much more honest than a shyster trying to sell snake oil.