Not being a native speaker, I am not sure whether the word "stamina" is proper. I hope you understand what I mean.
My goal is to improve the stamina for study. I want to be spending more time on studying not being exhausted or losing concentration. It would be better if I can sleep less. Many people around me claim that I need to do exercise for that. I have no idea if that's true, but I'm going to try it anyway.
According to my understanding, roughly there are two types of exercise: cardio and strength training. And it seems that doing one type of exercise can cause a negative effect on the other. For instance, they say long distance running destroys your muscle.
I am going to try both running and weight training, and I want to know on which I should spend more time for my purpose. Is there any research on this topic? Or could you share your personal experience?