Fast.

Scripture: Romans 12:1

And so, dear brothers and sisters,[a]I plead with you to give your bodies to God because of all he has done for you. Let them be a living and holy sacrifice—the kind he will find acceptable. This is truly the way to worship him.

Devotional

"Fasting gives birth to prophets and strengthens the powerful; fasting makes lawgivers wise. Fasting is a good safeguard for the soul, a steadfast companion for the body, a weapon for the valiant, and a gymnasium for athletes. Fasting repels temptations, anoints unto piety; it is the comrade of watchfulness and the artificer of chastity...For it is not possible to dare to perform sacred actions without fasting." [St. Basil, Homily on Fasting, 6].