Over the past decade, wellness has ballooned into a $4.2 trillion business. In the crowded marketplace of self-improvement, hardcore health innovations jostle with softcore supplements in the jade egg domain. Meanwhile, “hustle” culture has spawned a kind of work worship that has many people burning out and questioning how much they should really expect to get from (or give to) their jobs. In the midst of all this, workplace wellness is on the rise; more than 80 percent of large companies and 50 percent of small companies have implemented such programs. Despite their pervasiveness, big questions linger over what, exactly, works.