I've been doing Yoga for a while now. I always found Mantras silly. Until Raghunath Cappo explained that whether or not you choose to chant a Mantra, you have mantras in your head anyways. To understand Mantras as the sentences that just get stuck in our head and are playing on repeat, for years on end throughout the day.
There is a German comedian, called Johan König. He had a program that roughly translated to "without rehearsal". There is a bit in it, in which he comes clean and admits, he did have one rehearsal. He did the routine for his manager and the only feedback he got from that was:"Johan, the important thing is, that you think it is funny.". A more accurate translation would be"...that you like it.". So I now see that as a mantra that got stuck in my head for years: "The important thing is, that you (I) like it.".
Do you know how people hunch their backs and their shoulders come forward while sitting in front of the PC all day? And how it is common knowledge, that you should draw your shoulder blades together, and sit up tall, lift you chest and draw you chin towards your chest. If you never done sports before and start with a yoga that "just" asks you to sit up straight, that is a challenge. Because while it can be done for 10 or 30 seconds, we are not going for explosive strength with that exercise. We want to hold that for 5 minutes, or 10. You might sweat, you will go through pain, you might be out of breath afterwards. But the more you do that, the more natural it becomes. The easier it becomes, to the point, where hunching over starts to feel unnatural.
While bad posture around the chest and shoulders is common knowledge, I have the theory, that the pelvis and lower back, need just as much correction. And that that is why for some men over 30, their guts start to spill out. Because for the shoulders you draw you shoulder blades together and down, try to squeeze that imaginary pencil between your shoulder blades. For your lower body, you should tuck you pelvis(which would be over-correcting), but actual lengthen your tailbone down, lift from the pelvic floor, draw you upper and lower abdominal wall into the center, move your bellybutton towards the spine while breathing out, not in. BTW: Shout out to Yoga with Adrienne, my favorite Yoga Teacher on Youtube... and that lead me to the following mantra:
"You become what you are.".
It also made me realize why The Matrix is my favorite Movie. Other than being a more than decent action flick, it is filled to the brim with Mantras. The 147 Delphic maxims could be seen as mantras. The only one I don't quite understand is 095:"Control your wife", then again, I don't have a wife yet, may I be wiser when the time comes.