It is known that the most important aspect of the holiday of Purim is happiness and joy – and sometimes, the very insight into Divine Providence alone is more joyous even than rescue and salvation!
The Chofetz Chaim said, "Because we are approaching the time of the Messiah, and we will soon have to destroy the seed of Amalek, we are going to need a lot of strength. You must therefore stay fit so that you have the strength to carry out this task."