I assume you mean getting strong physically. There are numerous things you can do, such as work out, exercise, eat healthy food. Try to stay fit and not be lazy. Drink lots of milk, eat fruits, etc. There is so many things you can do, taking a jog, etc. I'd recommend that you work out a lot, and exercise.
They have strong legs so they can quickly get away from predators.
eat.
Quickly and Fiercely
Freud might interpret this as an inability to control unconscious desires and impulses. He might suggest that the individual is fixated at the pleasure-seeking stage of development and is unable to navigate the challenges of the reality principle. This behavior could be seen as a manifestation of unresolved conflicts from early childhood experiences.
It is where an idea or innovation spreads out quickly and remains strong in its central location.
tornado
you need to have a strong upper body while riding to be able to shift you weight quickly to avoid collisions.
tornado
It's strong because of all the bricks. The bricks are special bricks called "Madikers". These madikers have a big ball of fire in them. You put the madikers quickly on one another to keep them strong.
Fight strong opponents and have your Pokemon hold lucky egg.
Complex brains and strong opposable thumbs
they are strong , light weight , elastic and absorbs less water and drys quickly.