Introduction :Inactivity which is consequence of modern lifestyle has caused abnormal weight gain in adults, simultaneously the number of gyms which encompass resistance training equipment has dramatically increased as a result, more people tend to join these kind of clubs in order to reduce their weight‌ and fat mass also to gain suitable body composition.
The purpose of this article is to investigate the effect of resistance training on weight loss.

Methodology and Procidure: The information of this article has been accumulated through library studies and revision of related researches.

Results :According to the research of Joshua J Avila et al 2010
The effect of 10 weeks of resistance training with diet on 15 overweight men was compared with the effect of diet alone on 12 overweight men.
There were no significant discrepancy in the amount of weight loss between the two groups ,however the amount of pure muscle mass in people who exercised while went on a diet had a better improvement in compared with other people who just went on a diet.
Based on another investigation by P.Bory et al 2002, It Illstarted that resistance training alone has no impression losing weight and maintaining the lost weight in the long term. Another study by Maryam Takhti et  all (1400) represented that 8 weeks of metabolic resistance training along with CGA supplement significantly reduced weight loss and cholesterol decrease  in overweight adult women.

Conclusion: on the principles of researchers it seems that resistance training alone can not lead to weight loss and physical fitness unless it gets combined with diet and other training metods thogh resistance training can improve the pure muscle mass.