Never-Ending Routine; an Exercise Machine Walkway
Puzzle 19 of Words that Rhyme Piece of Cake Pack
Question is: Never-Ending Routine; an Exercise Machine Walkway
and the answer is: TREADMILL
Word Meaning:
TREADMILL — A piece of indoor sporting equipment used to allow for the motions of running or walking while staying in one place.
Definitions from Wiktionary.