One line of praise, said after each decade of the Rosary and at the end of the psalms.
A short doxology: glory given to the Father, the Son and the Holy Spirit, for ever.
When: At the end of each decade of the Rosary, after every psalm in the Liturgy of the Hours, and whenever something good happens.
Why: It turns any prayer toward praise, which is the one kind of prayer that asks for nothing.