"Warm-up" in the sense of a brief exercise that readies one for a game or performance?
without context, yes, it means the brief exercise.
"pemanasan" could also mean the process of heating something, eg. boiling water
I think it could also mean a "heater"
If there is intelligent life on another planet and they use duolingo to brush up on their english before our first encounter it's going to be a pretty weird conversation.
This warm-up to climb this mountain range is perfect.
Pemanasan untuk mendaki pegunungan ini sempurna. - (google translate).