It is a common a tradition to set New Year’s Resolutions, meaning that early in January the streets and parks are full of joggers in gleaming new kit; shopping takes longer with people checking the label on foodstuffs to see if it fits with their juice/paleo/low carb/high protein/just-going-to-eat-less diet.
Yet by about now (writing mid February) that kit is in a drawer somewhere, or at the bottom of the washing basket. The diet turned out to be too complicated/difficult or a lapse turned into collapse.