Many neo-Evangelical/post-Protestant groups are looking for ways to practice their faith more actively, while retaining their aversion to anything "traditional." So, there are groups that have fasts, but they won't call it Lent; people who are living essentially like friars, but deprecate monasticism; groups that do healing services with oil, but won't call it a sacrament.
As an aside for the Daniel Fast followers: if they wanted to be really Biblically hardcore, they might consider doing the Jesus Fast. They could go into the wilderness and live off the land for forty days.
And then, hopefully, jump off the Temple.