The phrase "going uphill" typically implies a difficult, challenging, or uphill battle. Some antonyms that could be used to describe a positive or effortless endeavor may include "going downhill", "cruising", "coasting", "gliding", or "sailing". Alternatively, it could be described as "going with the flow", "easing along", "breezing through", "negotiating", or "floating". It's important to note that the context in which these antonyms are used can change the meaning or connotation of the phrase. Regardless, they all paint a picture of a much more relaxed and easier journey compared to the struggle of "going uphill".