Spotting takes practice!
There are lots of spotting techniques for each skill.
Practice how to move your hands, where to spot on the child, how to move your feet, pivoting, etc.
Different students require different spots.
“Lefty” vs “Righty”
Flexible vs infelxible
Level of strength

Use your large muscle groups to lift and catch.
Spot with the child close to your body.
Alternate sides frequently.
Height and Distance matter.
Your personal strength is important!
Learn from others.