Everyone in the business of developing hockey players is trying to convince you why their system is the best, most effective method of training.  My suggestion is to shop around and know what you are buying or who you are training with.  In the hockey business I  have certainly seen enough false advertising, fake resumes, exaggerated claims and outright lies to choke a donkey! 

Many off-ice trainers have never even played or coached hockey players...so how do they know what makes a good player?  Other coaches only work with elite athletes so it's been a while since they worked with a midget or junior aged player (who has vastly different goals compared to a pro). 

I wish I could be more professional and not talk so much trash about hockey trainers...but I just can't justify, believe or trust many things they say.  So rather than sound bitter I'll simply say this:  question everything and everyone until they get you results!  Better yet, try a trainer who offers a money back guarantee...like DP Hockey.