Ask HN: Advices for Someone on Early 20
I understand the advices like 'eat healthy', 'go excercise' but how do you do it actually. How do you build the discipline?
First you need a purpose, a motivation. Not the kind you get on a sudden morning, but a visualization of how the end result is going to be. Because, the sudden motivations will go at the same speed it came to you. But many of these things needs a lifestyle change and lifestyle change needs consistency and for consistency you need to have something to hold on it.
Unless you have those "vision" to see yourself of, it is very hard to motivate yourself when you don't have results or if you're not motivated. Then again, many of these things I have heard in my early years but took the later half to figure out and settle on. So give it time, it will come.
Discipline as you note is essential in anything you do, work related or otherwise, there isn't much that I can add here that you can't already find via a few searches, for me it's always helped taking things one step at a time.
When you exercise learn to appreciate how it makes you feel. Think to yourself "I am getting stronger, better looking, this is great!"