Improve your concentration- about coffee

Hi!

Do you know maybe how can I improve my concentration at work, at home, studying, working, doing something important? 

I will be happy to get to know how can I do it profitably and efficiently. 

I'll write what I usually do, but I ask you to tell me what methods do you use, prefer?

Like this? Meditation?

Drinking some coffee?

Or cup of tea? 

Or maybe you massage your temples? 

For example, when I'm trying to concentrate on something, first I must to ensure the biological needs and be rested. If not, well.... There are some ways to wake up and improve our concentration.

I must to be fed state too and have some water and sometimes chewing gum next to me.
Well seated on the chair I can get to work. When I start to feel tired I do some breaks or some exercises. I like also take break as walking around with my dog for example.

I know that many of us drink coffee to wake up but it's not the best idea. Coffee raise our blood pressure in a violent way and after a temporary surge of energy I fell horrible sleepy and it starts over.
Of course, people appreciate coffee for the taste, but the truth scientifically proven is that coffee leaches the valuable elements from organism. So, maybe limit to one cup a day, just for flavor if you like, or for the boost of energy ;)

As a substitute you can try a tea, which works gradually, in opposite to coffee. I propose you green tea or others, because black tea has similar ingredients as coffee.

What do you prefer to drink? Coffee, tea? Or maybe some fresh juice? Any sport activities? Or maybe sleep?