For you be become strong physically, you have to make a commitment to be. And this strongness would have to be something done insideout, not the one you have to focus only on physical training alone. Because anybody you see out there with strong physique, it began by investing on internal part of the body.
So, if you really desire strong body, you have to eat well, which is consumption of balanced diet containing all the six classes of foods. Basically, let your diet to be rich in proteins and healthy carbs. More importantly, avoid the eating of processed foods considered as junk, as well as drinking of bottled soft drinks that are packed with sugars, instead go for raw fruits plus vegetables, and drink plenty of water. All these would help you have strong bones that would support your intense physical activities needed for strong muscles.
Now, you can then switch to resistant exercise that would tone your muscles, which would in turn accelerate rapid build up of muscular fibers. Exercises like plank, pull ups and push ups are great ones to begin with. You can as well alternatively hit the gym for better results. With these few exercises, you are definitely on your way of having strong body or being strong.