Thanks for the replies. What I want is simply gaining little bit of muscle mass without stressing myself too much tbh. Like I said I only weigh 52 kgs right now so I don't know upping my weight to 60-65 and if that extra kilos I will be put on coming from a muscles and not from fats makes me a happy man in the end.

Hello. In general, I am in good shape metabolically, but I have neither fat nor muscle (as a male I weigh 52 kilos :/). Since going to the gym is not something I prefer, how can I gain muscle by following an exercise program at home using only 5kg dumbbells? The "programs" I've tried on my own so far either tire me out or make me feel like I'm not working hard enough. How do I know when I'm doing something that's the ideal difficulty for me?

Also, I have almost always weighed 52 kilos in my entire life. I always attributed this to my fast metabolism, but if anyone has advice on that subject, I would like to hear it too.