The Hindu practice of thoughtful meditation including mental and physical focus in order to become one with Brahman is called

Dhyana.

Explanation:

Dhyana is the seventh stage in Yoga practice of the eigh stages. The term is used to the seventh limb or level in the practice of Yoga.

The other limbs that follow dhyan are Yama, Niyama, Asana, Pranayama, Pratyahara, and Dharana; and the last stage of Yoga practice is Samadhi.

In dhyana, the meditator is required to concentrate on a point of focus with the aim to attain the knowledge of truth. This stage also involves with the attainment of self-knowledge.

This practice of dhyana is the Hindu practice of meditation with mental and physical focus. Through this practice, the meditator also attains oneness or non-dualism with 'Brahman.'

Thus the correct answer is dhyana.