Do you mean physicly or metically?
Well strong in like muscle and strong as in like you make good pathways in your life and you can like be a strong person just by thinking strongly and knowing to be strong. If you do all of those then you won't be one of those show off saying " oh look at me i'm strong". If you want to be strong you have to be strong on the inside not the outside. It like you look like a kind person but are you really? Now that's the big question. If you want to be kind you have to have kindness in your heart. And that the Answer to your awesome most greatess question yet!