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Look for accredited training certifications from top organizations, some of the best:
1. ACSM – American College Of Sports Medicine 2. NASM – National Academy Of Sports Medicine 3. NSCA – National Strength And Conditioning Association 4. NCSF – National Council On Strength And Fitness 5. NFPT – National Federation Of Personal Trainers 6. ACE – American Council On Exercise 7. CI – Cooper Institute 8. Scirion Institude (SIEP) 9. ISSA – International Sports Science Association
Other important factors- education(degrees), years of service(experience), is that person compatible with what your looking for(training style). A good source to start with is U.S. Registry of Exercise Professionals.