Not sure if this point was mentioned yet. The Six Recollections are a practice shared by Mahayana, yet rooted in the suttas. From the Mahanama Sutta
here is the first recollection:
"One who is aroused to practice is one of conviction, not without conviction. One aroused to practice is one with persistence aroused, not lazy. One aroused to practice is one of established mindfulness, not muddled mindfulness. One aroused to practice is centered in concentration, not uncentered. One aroused to practice is discerning, not undiscerning.
"Established in these five qualities, you should further develop six qualities:
 "There is the case where you recollect the Tathagata: 'Indeed, the Blessed One is worthy and rightly self-awakened, consummate in knowledge & conduct, well-gone, an expert with regard to the world, unexcelled as a trainer for those people fit to be tamed, the Teacher of divine & human beings, awakened, blessed.' At any time when a disciple of the noble ones is recollecting the Tathagata, his mind is not overcome with passion, not overcome with aversion, not overcome with delusion. His mind heads straight, based on the Tathagata. And when the mind is headed straight, the disciple of the noble ones gains a sense of the goal, gains a sense of the Dhamma, gains joy connected with the Dhamma. In one who is joyful, rapture arises. In one who is rapturous, the body grows calm. One whose body is calmed experiences ease. In one at ease, the mind becomes concentrated.
"Mahanama, you should develop this recollection of the Buddha while you are walking, while you are standing, while you are sitting, while you are lying down, while you are busy at work, while you are resting in your home crowded with children.