Translation of "Stretches" in Japanese

This material stretches easily.

この生地は引っ張るとすぐ伸びる。

Not only stretches but also flips the block in opposite direction.

ブロックの向きが 逆になることを目で確認できます

That exercise - backs together, link arms, one bends forwards while the other stretches their back - we did that a lot as children, didn't we?

背中合わせに立って腕を組んで、一方が前屈する事でもう一方の背筋を伸ばす体操を、子供の頃よくやりましたよね。