Polar bears walk on 4 legs / paws. But they can briefly stand on their hind legs and take a few steps, such as in a fight with a predator. They then return to all-4s. Polar bears also often slide on their bellies across ice.
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Relative to its body, a grizzly's legs are actually considered long. This is especially noticeable when these bears have just come out of hibernation. Their legs look more short and stocky when they've put on a lot of fat in the fall in preparation for winter hibernation.
They have evolved so as to be able to face, and survive living in deep snows, and digging birthing dens, and swimming distances.
Polar bears have very strong legs and feet which help them to dig through snow and ice.