At the Catch: ​​ --Skying: Where the rower drops their hands at the catch. This causes the blade to move higher off the water and will disrupt the set of the shell. --Late square: Where the rower's oar is still in the feathered position at the catch, results in part of each stroke being missed when they square up their oar after they start the stroke. During the Drive: --Missing Water: Where the rower begins the leg drive before the catch has completed and contributes to sub-optimal boat speed. --Digging: When the blade of the oar goes deeper in the water than it should, slowing the boat down.​​ --Washing Out or Air Stroke: When an oar comes out of the water during the drive and creates surface wash. This results in a reduction in speed and can disrupt the set of the boat. At the Finish: --Crab: Occurs from a blade work error where a rower's oar is pulled underwater. A crab can slow down or even stop the boat. In extreme cases a crab can eject the rower from the shell. Usually caused when a rower's blade tilts opposite of the squaring motion. During Recovery: --Rushing: Where the rower moves toward the stern during the recovery before the rest of the crew. This increases the amount of check during each stroke. Also referred to as 'shooting the slide.' Also means all other rowers have to work harder to mitigate it. --Check: The reverse momentum resulting from the crews’ body weight moving toward stern during the recovery. Check is unavoidable but can be minimized through a very quick square-up and drive.