Today is Wednesday (fast and partial abstinence from meat) in Michaelmas Embertide which includes this Friday (fast and full abstinence) and Saturday (fast and partial abstinence). Below are the words of Pope St. Leo the Great on this holy tradition. Also, please watch my video on this https://youtu.be/epdFeS-vXiE
"Well do I know, dearly beloved, that many of you are fervent in your observance of all those practices which belong to the Christian Faith, so that ye have no need to be admonished by our exhortations. For what tradition hath laid down, and custom well established, is neither unknown to the learned nor neglected by the devout. But because it appertaineth to the priestly office to exercise the same general care over all the Church's children in all such matters as be profitable alike to the learned and to the simple (both of whom are equally dear to us), we do now exhort the both of you to celebrate, with lively faith, and all due discipline of soul and body, the Quarterly Fast, which the seventh month [that is, September] doth once again bring to us in its yearly round. The Ember Days of fasting are appointed to the four seasons, in order that their quarterly recurrence in the course of the year may teach us how unceasingly we need to be purified, and how, as long as we are tossed about by the changes and chances of this life, we need through fasting and almsdeeds to be cleansed from the stain of that sin which we have contracted by the frailty of our flesh and our concupiscence. Let us diminish a little, beloved, what we are accustomed to use for ourselves, in order that we have somewhat more to use for the relief of the poor and needy.
The conscience of the generous can thus be made glad by the fruits of their own liberality. Whilst thou art giving happiness thou shalt receive joy. Thy love for thy neighbour is a unity with thy love for God; and he hath taught us that in the unity of this twofold charity is to be found the fulfillment of all the Law and the Prophets. Further, if anyone doubt that what is given to man is offered to God, we have the saying of our Lord and Saviour, when he spake of feeding and helping the poor: Inasmuch as ye have done it unto one of the least of these, my brethren, ye have done it unto me. Wherefore, let us fast on Ember Wednesday and Friday; and on Ember Saturday let us also keep vigil at the shrine of blessed Peter the Apostle; by whose merits and prayers we believe that we shall be aided, so that we may please our merciful God in our fasting and prayer.