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](https://www.youtube.com/watch?v=DZ9pspd0-9o) 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?