Stacking

This is what the cups are -

a couple of benefits

Ambidexterity
Using your left and right hands with the same ease and skill; very handy when it comes to dribbling and shooting a basketball, using the computer, playing the piano, sport stacking and much more.

Michelangelo, Ben Franklin, Einstein, and more, were ambidextrous.

Bilateral proficiencyEqual performance on both sides of the body — to be able to use both hands equally well. It requires practice.

Become ambidextrous and along with physiological brain growth, a more balanced integration of your two brain hemispheres will be achieved.

Studies have shown that ambidextrous people are more emotionally independent, more determined, more adaptable to new situations and more apt to handle problems without giving up.

Focus
The ability to concentrate.
Hand-eye coordinationHand-eye coordination - Having your brain tell your hands what to do and having them actually do it, like catching a ball or stacking cups.