Accountability?

Something just struck me about the concept of accountability: I think it's very difficult for anyone – Christians included – to hold each other accountable to not doing something. Accountability to do something is much easier, because you can partner up and do it together – exercise, prayer, eating broccoli, etc.

But accountability to not do something – typically something sinful, but perhaps something innocuous like "not over eating" – is much harder because you can't partner up to "not do something."

Does that make sense? And, if so, how do we fix that?