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Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Etymology Explore the origin of the 'core words'.

{n}	exercise	(any activity designed to develop or hone a skill or ability)	Übung {f}
{n}	exercise	(physical activity intended to improve strength and fitness)	Übung {f} [a specific exercise], Training {n}, Sport {m} [general exercising]
{v}	exercise	(to perform activities to develop skills)	üben, trainieren