Is “Workout” a Scrabble word?
Yes
WORKOUT
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Workout
/ˈwəːk.aʊt/
noun
1.An exercise session; a period of physical exercise.
2.A schedule or program of specific exercises, especially one intended to achieve a particular goal.
3.(by extension) Any activity that requires much physical or mental effort, or produces strain.