Theropods are classified by having hollow bones (among other features). In birds it makes sense to decrease weight enough for flight, but in non-flying creatures it seems like any increase in running speed and agility would be outweighed by the accompanying fragility of the skeleton, especially with an unhappy meal fighting back.
Did Theropods scavenge or eat things that didn't pose a danger, or were some of the bones solid like in ostrich, or are hollow bones much stronger than I imagine?