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If you pay attention to these mistakes; the results you will get will be 2 times faster than others !! Studies: Research showing that 12-15 repetitions may be the best repetition range for beginners: https://www.ncbi.nlm.nih.gov/pubmed/1... Research showing injury risks according to sports branches: https://www.ncbi.nlm.nih.gov/pubmed/2... Stay UNSATISFIED !!