You have not passed any training, gradually raise number of recurrences, accurately add on 2 1/2 pounds to a bar, however for last two months your biceps has increased all for 1/8 inches. Also it is all your progress … And you think, what only constant growth of muscles is a unique attribute of progress? Do not despair, your muscles grow, simply it occurs slowly. Have patience, concentrate on details, and all to you will come in due time. To construct qualitative muscular weight, long, heavy work is required.