Process flow diagram - Typical oil refinery. This is a schematic process flow diagram of the processes used in a typical oil refinery. This process flow diagram (PFD) example was redesigned from the Wikimedia Commons file: RefineryFlow.png. [commons.wikimedia.org/wiki/File:RefineryFlow.png] This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Each gym also provides its members with access to state-of-the-art equipment. While members need to be 18 years old to sign up individually, those who are at least 14 can sign up with a parent or legal guardian.
They won't know if you just came in from the weight room, whether you're going to a class when you're done, or what. My gym has a really diverse range of customers, so there are people at all levels of fitness. There are people who are nearing 80 who walk very slowly on the treadmill to get their daily exercise in.