all my gym bros.. do u take pre-workout? is it effective?

Given the increase in number of heart attacks , it would be better to consult to doctor regarding this as each body is different. It would be better to avoid this so called supplements which can have many side effects to body .

That's becoz pre-workouts contain high doses of caffeine.. I would recommend to have just one cup of black coffee as your pre-workout

No, just a little bit of coffee.

Add one apple after black coffee if case u feel to eat something . Also drink some hot water with honey / lemon first before taking black coffee