I had joined gym about two and a half years ago (when I was 18) where I used to workout on my arms, shoulders, chest and back. As a result of tough days with my studies, I had to discontinue my routine. Now a week has passed since I rejoined but I feel like I have lost most of my stamina. While I had accomplished to workout at least 10 reps in each set with full comfort, now it gets too hard for me to manage 6 and 8 of them almost kill me even with much less weights attached.
Is this the long break I have enjoyed that my body has gotten too lazy? Would I manage to get back what I have lost?
Note: Any suggestions to build up stamina would be greatly appreciated.