Concentric – Shorten, and referring to movement up towards the sky
To remember what concentric means use the following mnemonic:
Concentrating is not an easy trick (concentric) when you are staring at the shorts of ten (shorten) gorgeous men.
And to remember it's up:
Relate the first letter of concentric to
C = Look up to the Clouds
C = Up
Concentric = Shorten
Concentric = Up
Concentric would be shortening of a muscle and is usually associated with a movement upwards.
An example of a concentric contraction would be moving a dumbbell up to the body. Up being the memorable word.