As is becoming my custom, I began Ash Wednesday and Lent by going upstairs into my small private chapel and lying prostrate in penitence for a time.
I will not say my thoughts did not stray. Ah, that much more about which to be penitent.
Although prostration during Ash Wednesday is not now a common practice to my knowledge (Learned readers, feel free to educate me.), it does have a history, including in the Sarum Rite as I wrote two years ago.
Whatever your posture, may you have a blessed and edifying Lent.