Abstract The purpose of the research was to survey effect of exhaustive resistance exercises with various resistances on local strength of youth muscles. The resistance exercises are very important in developing physical capacities of individuals. It is necessary to consider several variables including resistance rate and repetition of exercises and rest time between exercise bouts. The subjects was, 44 healthy male students with no history of resistance exercises with age range: 15-17 years (mean age: 16.1 years). Performing exhaustive resistance exercises with 55, 70 and 85% resistance of a maximum repetition significantly increased the strength of upper and lower extremity muscles of 15 to 17 year old male adolescents (p<0.05). The effect of exhaustive resistance exercises with 55, 70 and 85% resistance of a maximum repetition had a significant difference on strength of upper and lower extremity muscle strengths (p<0.05). Such exercises with 70% maximum repetition were more effective upon strength of upper and lower extremities. So, performing exercises with 70% resistance of maximum repetition for adolescents may be the best way to increase their muscle strength.

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