Staying on the treadmill refers to persevering in a particular endeavor or task. A synonym for staying the treadmill is 'pushing through.' This phrase implies that one is determined to succeed despite any obstacles that may arise. Another synonym is 'hanging in there,' which suggests that one is not giving up despite facing challenges. 'Continuing on' is also a similar expression and conveys the idea of not stopping or quitting. 'Persevering' is another synonym for staying on the treadmill, which emphasizes the determination and resolve needed to achieve a goal. Similarly, 'enduring' and 'persisting' both imply a steadfastness that does not falter in the face of adversity.