After The Couch was replaced with a treadmill (because Cyborg and Beast Boy were abusing its comfortable goodness), the Treadmill Spirit came into the two friends' lives and convinced them to live a life of motion and energy. But later, his persuasion faltered, and Cyborg and Beast Boy lost interest in exercising when he pushed them over the limit.
Later, the Titans retrieved the couch but decided to still keep the treadmill. Robin liked the idea because he thought he had more time to work out, but Treadmill Spirit probably gave him second thoughts via a cruel workout.
- Lazy Sunday (debut)
- It seems to be a running gag that the Titans furniture have a "spirit".
- It is not known if Couch Spirit and Treadmill Spirit are related.
- Treadmill Spirit is able to lift weights with his pecs.