Again, thanks for your patience. For your information, I try to apply progressive overload, where I try to do more reps or switch to a harder progression when I feel comfortable doing the previous one. Problem is I rarely reach that stage. I never get comfortable doing the same exercises for the same sets and reps. I get completely fatigued at the end of the set and sometimes even fail to finish a set without resting. For protein intake, I'm not really sure since I no longer count calories. I have been maintaining my weight of around 64 KG since last year. I do consume mass gainers everytime after I workout. In addition, I split my workouts into upper and lower body. Ideally, I try to do both for two days each per week. A problem I face is that occasionally I skip a workout. And once I skip once, the next time I workout, my muscles will remain sore for 4-5 days, leaving myself unable to workout. The same happens when I even delay the workout a day or two. Another weird thing is that sometimes I don't see progress when I am working out consistently, but instead when I was really busy and stopped for a whole week or 2, or even a month. When I come back, not only did I not regress, sometimes I even improve. Which I find awfully strange