How to become a Fitness Trainer?

Encaitare asked: Is it hard to become one? Like a yoga instructor, pilates, etc…
Is the schooling long?

Yoga, Pilates Instruction Question?

Peaceful Dove asked:
I’m thinking about taking some classes in Yoga or Pilates and the thing is that I found out that the instructor has no certification/training, they are completely self-taught and yet they are teaching classes to the general publlic. Do you need to be certified to teach classes like this? It happens [...]