It is very difficult to be grateful and unhappy: Intuitively, we know this. Gratitude is one of the strongest emotions that sweep through you and is relatively straightforward to induce. It has been researched for many years by prominent psychologists like Robert Emmons and Michael McCullough who, together, have even gone so far as to develop a gratitude scale. Increasing gratitude has been proven to significantly improve the quality of one's life. Unfortunately, however, in many cultures, there is no mainstream vehicle for expressing gratitude to loved ones.
Experimenting with gratitude can be done both solitarily or socially, as long as the participants are consciously honing in on whatever authentically gives rise to the feeling of gratitude. A profoundly underappreciated shared activity is the Gratitude Night Challenge. For this exercise, you can find it as a stand-alone challenge in this app. This challenge continues with the solitary form, called the Gratitude Journal.