PRACTICE or training:
The right "A" hand brushes up against the top side of the left index finger. The
motion is similar to polishing a shoe.
Think of "polishing up your skills."
If you do the sign "practice" using a right "T"
hand, it specifically means "training."
Some people might consider this to be "Signed English." Most of the time you
wouldn't need a "T" to establish the meaning of training because the context
of the sentence would tend to clarify whether you mean training or practice.