The word "on treadmill" implies a monotonous and repetitive activity that one may find boring. Antonyms for this phrase could be "off treadmill," which could suggest a break from routine and a chance to explore something new. Other antonyms could include "moving freely," "taking a stroll," or "enjoying the outdoors," all of which indicate a sense of freedom and spontaneity. These words can help reframe the idea of being on a treadmill as a positive experience or opportunity for growth, rather than a tedious task. By using antonyms, one can shift their perspective and find joy in even the most mundane activities.