Translation guide
For the exercise machine, use トレッドミル or ランニングマシン. For the figurative meaning of monotonous routine, use 単調な繰り返し or similar expressions.
Referring to the piece of gym equipment for walking or running in place.
Describing a repetitive, boring, or unending task or lifestyle, often with a negative connotation.
I used the treadmill at the gym.
I have a treadmill at home.
Every day is a treadmill of monotony.
Means 'repetition of the same thing'. Common and easily understood.
Work is a treadmill of the same tasks; I get bored.
Literally 'endless routine'. Conveys the feeling of being stuck on a treadmill.
I want to escape this treadmill of endless routine.