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Nautilus Training Bulletin Number One by Arthur Jones
Nautilus Training Bulletin Number Two by Arthur Jones
Two of the most important books ever written on exercise.
You can read them for free if...

Jumping into Plyometrics written by Donald A. Chu would be great for Personal Trainers

My opinion is stick with the Gym. You need to be around other people of every different kind of level. You have enough days to do a split routine,
without overtraining.

I Highly recommend NFPT. All of the content is practical and well presented. In other words they do not go overboard and overdo any aspects. I am a 40 year body-builder and am impressed with NFPT.