There are many machines out there that can test anything under the sun.
And let's talk about body composition; basically, the amount of fat and muscle one has.
Is that relevant when a fitness program is created?
I would say no.
It is more important to ask how one feels and take measurements from this client and track it.
That would be the best approach.
One crucial point is that most methods of measuring body fat are faulty and not correct at all.
The focus should always be on quality of diet and training, consistency, and that's it.
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We are entering an era of high innovation and technology in the fitness industry.