To achieve any goal, we need to break old habits that may have been formed over many years and replace them with new ones. The rate new habits are achieved depends on the complexity of the task. So it’s easier to adopt a simple habit of drinking an additional glass of water per day rather than achieving a more complex goal of daily gym attendance. Research indicates that it takes around 66 days for a new habit to be formed. So it’s much easier to work on simpler tasks rather than trying to adopt a more complex behaviour change.