Newbie question.

I want to make a wooden stool, quite an unsophisticated one,
with four legs square in cross section.

It will be used for usual stooly things such as standing
on to reach things that are high up, and carting to places
one wants to sit but doesn't want to cart a dining or office
chair to.

The 25mm x 25mm sticks at B&Q obviously aren't strong enough.

Could someone please help me with what sort of wood I need,
and where I might get it?

Many thanks!

Cheers,

Chris