The double move action represents a hustle. Moving three times your character's standard speed is a running pace for a character in heavy armor. Moving four times your character's standard speed is a running pace for a character in light, medium, or no armor. If more than one condition applies, multiply the normal distance covered by all movement penalty fractions that apply. Tactical Movement Use tactical speed for combat.
Some creatures have other modes of movement.
The creature can tunnel through dirt, but not through rock unless the descriptive text says otherwise. Creatures cannot use the run action while burrowing. The creature must make a Climb check to climb any wall or slope with a DC of more than 0, but it always can choose to take 10, even if rushed or threatened while climbing. The creature climbs at the listed speed while climbing. Creatures cannot use the run action while climbing.