Giant animals tend to be slow-moving and clumsy. A Brachiosaurus that weighed 78 tonnes, for example, is believed to have walked at a pace of about 1 m/s with 2.5 m long strides. Kinesiologically speaking, if the creature had walked any faster, its 3 m long legs would have snapped because when the animal had taken a step, its weight would have all of a sudden been expressed at an angle through the limb bones and oblique weakness zones would have caused the bones to fail (Benton, 1990).
The assumption that large animals were sluggish is not always true. Tyrannosaurs were probably able to run very quickly, judging from their powerful legs, but its endurance would have been very low. The animal's metabolism would have hindered it from running long distances.