Psalms 6, 31, 37, 50, 101, 129 and 142
By order of Pope Innocent III (1198-1216), these prayers are to be prayed during the days of Lent. If they can't be said on each day of the Season, they can at least be prayed on Lenten Fridays (or one could pray one prayer on each of the 7 Fridays of Lent). One kneels when praying these Psalms, begins and ends with a short antiphon, and recites a Gloria in between.