Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to karate chop [title] Place the wood (or brick) on two stable chopping blocks, with the wood grain running in the same direction as the way your hand is facing to chop. [step] Chopping with the grain makes the wood easier to break. [substeps] Choose thin, smooth board for chopping, such as slim pine boards.

Ending1: Use the grain to guide the blade up and down. Use soft boards, such as plywood, to chop smaller, more powerful pieces of wood. Ending2: Stable boards are more flexible; solid boards bend slower and are easier to crack. [title] Lay out the board, legs and all, on a flat surface. Ending3: Don't try to chop anything that is too thick or hard (3 " maximum is suggested to start). A cinder block may be possible if you have been training for a few weeks and yell very loudly when making contact. Ending4: Use medium thickness boards if you want the wood to be narrower when you chop it. [title] Place the wood-either on a piece of scrap wood or plywood.

Answer format: ending1/ending2/ending3/ending4