anaerobic exercise

NOUN
18 LETTERS · STARTS WITH A

anaerobic exercise is a valid 18-letter word worth 30 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1N1A1E1R1O1B3I1C3E1X8E1R1C3I1S1E1
1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 3 + 0 + 1 + 8 + 1 + 1 + 3 + 1 + 1 + 1 =30 PTS
DOUBLE WORD → 60TRIPLE WORD → 90
MEANING

What does anaerobic exercise mean?