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.
In fact, the same parents who are worried that 10, 11, 12, or whatever is too young to start weight training often seem to be the ones who have their kids swimming or playing volleyball or doing gymnastics 10 hours a week year round.[2] In fact, there's good reason to start at age 11.