Spin it, flip it, and bake it how you like, but the fact of the matter is that commitment is required to achieve the true benefits of Yoga that you seek (the full version of the practice that encompasses all Eight Limbs that include, and are not simply limited to, Asana exercises). Yoga that is devoted to reaching an enlightened state of Self-Realization requires effort each and every single day. This is especially true if you are incorporating a Japa routine into your practice.
Once your preferred mantra has been selected for your Japa practice, commitment is the water that creates the right conditions for the seed of your unwavering, heart-felt intention/vow, or Sankalpa, to take root and grow. Commitment is what makes your goal of connection with your True Self possible since the very act of sticking with your Japa practice is what supports you with developing the power, strength, and clarity that is required to achieve your goal of full Self-Realization to begin with.
Deciding to engage in Japa practice is one of the truest tests of your intention to see your practice, and goal, all the way through to the very end. Saying “yes,” to the devotion to understand, and fully embody, your truth is one thing, but making the effort every day to stick with the mundane and repetitive task of mantra repetition that is required to manifest the reward at the end of your practice proves (to yourself and to your Higher Self/goal) that you truly mean what you say you do.