I want to practice Kungfu/Shaolin to increase my stamina. I'm a software engineer and spent much time in front of a computer. I feel I'm very weak. I'm easily tired, easily depressed.

I found this tutorial on Youtube and am planning to follow it.

Please advice me if the quality of the tutorial is good? And if it is good, how much time should I spend per week to practice effectively?

If the tutorial isn't good, which tutorial is good for me in order to increase my stamina?