In this life, I personally tend to believe that your frame gets tested every day by people, and especially people who succeed less than you, probably by people of your social circle too. The more you pay attention the more you will notice this impacting your every day relationships.

In order to build a stronger frame day by day, you have to understand what frame is. I did this my own way through talking to people often and seeing how they would respond to different questions and in different topics, and also challenged my self to go out with Alpha males and talk to women and guys everywhere, I would notice that when I was taking a break from the gym and started losing gains, people I confronted pointed their attention towards me in a negative way, counter-asking questions or simply throwing a statement out of the blue that put me in a test, like a shit test. Because I looked weak. The weaker you look, the more they will try to break you and test you like in school, with the bullies. But it also happens that you get tested while you're in a good form.

Let's begin with understanding the term 'Frame'. Like fnordsnord once said :

Frame is your worldview. Not merely what you think the world IS, per se, but the way you think the world ought to be. When something is not right with your world, it is Out of Frame. But it's also the ruleset you live by. The way YOU make YOUR world work.

https://www.forums.red/p/TheRedPill/2496/what_is_frame/234978/

It's simple as that, frame is how you view the world around you and how you view yourself in this world. In order for it to be unshakable you have to start building and holding it every time you can, after getting used to it, it will be a game to you and seem like a habit you formed. Building your frame though, isn't only a mental process which is as important, but it's also physical and I'll break my view on this down below.

Before entering the mental side of building frame (I'll speak my view on this on a different post) let's take a look on the physical way around. In order to look strong and unshakable, but also be it, it's important you HIT THE GYM. It doesn't matter how hard it may seem now, you have to get your lazy ass off the excuses and start eating and working a program out according to your goals, which in the end will pay off very good regarding frame control. If you get into a daily habit of training your body, your mind gets set this way too and you feel stronger and fearless. It is important to have a strong body, that also looks worked out because people will respect (fear) you more and will not try to test you. You will be a moving time bomb to others and this is especially attractive to women.

In accordance with this is body language. It's not only imperative you get a good looking body, but also get a more dominant body language that conveys strength and fearlessness, the dude you just got introduced to by a group of people/friends who would test you out in bar to AMOG you in front of women will now be less inclined to do so and have second thoughts, his inner beta will have a conflict with what he was intending to do in the beggining because he's intimidated of crossing the line. However, there will be people who will try nonetheless but the effect is double, once you're dominant and content you will be able to battle their behavior and show them you won't tolerate shit thrown your way.

Dress well. This one speaks on it's own, get a fashion consultant or a tailor and get your looks set according to your own personal taste of course. Wearing slim but not too tight t-shirts, mostly plain by the colors of khaki, black, white and red along with some slim fit jeans, ripped or solid worked wonders for me, it helps show your physique more and you'll get commented on it by women most of the time, and mostly positively. Unless it's a shit test, but since you get to pick clothes you like and you look good it will be a piece of cake maintaining your confidence and frame. Looks are important but to a certain extent, and it is essential you pick the right clothing choices once you build an attractive physique, try to let it show, don't hide it. It will boost your confidence thus making your self image stronger and more dominant in your mind.

Practice your walking, keep in mind that straight posture is important, when you walk, when you stand. Pull your shoulders slightly back, arch your back and don't keep the head too high or too low, eye level.

Maintain strong eye contact. You'll want to look people in the eyes and especially women when you talk to each other from a close distance, practice this all the time. When you look people in the eyes, you seem more straightforward and show you're not afraid of confronting them, making some of them think again before testing you and if they do you will maintain your power while you answer straight looking them in the eyes, conveying power and bravery.

Go out and practice, don't forget to hit the gym and when you're out there live your life by your own terms and don't be afraid to show it physically. You are building your self and walking through a path to improvement, and you won't tolerate people's bullshit getting in your way to success. Don't be afraid to test them by doing all those things too. As long as you keep your shit together and follow these steps you will definitely attract more attention from people, and some will try to push you and test your frame, give them a good taste of what it is to not give a fuck about their world view and display your power over anything that stands in your way. This is all my personal opinion on this subject, and the way I interpret frame so take your time and adjust on anything you want. I'm open to discuss opinions.

TL;DR : Holding frame is a mental process, but it's also physical. Get this on point and you'll be good to go full on dominant in social situations.