Grapple Jump
From A complete guide to Super Metroid speedrunning
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By swinging from grapple, morphing, and unmorphing before losing vertical momentum, it is possible to jump again midair. These may be chained indefinitely (or until hitting the ceiling).
After running out of horizontal momentum, you cannot move horizontally except by arm pumping until vertical momentum is lost or Grapple is used (in which you can no longer grapple jump).
This is easier to perform underwater and is easier with Hi-Jump Boots, but neither is required.
