I really love the song / Kirtan chant of Lokah Samastah Sukhino Bhavantu (Sharon Gannon version I play for my yoga classes), and was turned on to the song by the amazing Mantra Ma & Shonali Banerjee. It really gets the energy moving in the mornings.
What the Sanskrit words mean, and think of how amazingly it shifts your energy.
lokah: location, realm, all universes existing now
samastah: all beings sharing that same location
sukhino: centered in happiness and joy, free from suffering
bhav: the divine mood or state of unified existence
antu: may it be so, it must be so (antu used as an ending here transforms this mantra into a powerful pledge)