Question

glenn is training himself to clear his mind by repeating a sanskrit mantra. glenn is practicing
self - hypnosis.
transcendental meditation.
mindfulness meditation.
biofeedback.

Explanation:

Transcendental meditation is defined by the use of a specific, personal mantra (often a Sanskrit word/phrase) repeated to quiet the mind. Self-hypnosis focuses on guided suggestion, mindfulness meditation involves non-judgmental awareness of the present, and biofeedback uses physiological data to regulate bodily functions, none of which match the described practice.

Answer:

transcendental meditation.