The senses are called the horses, the objects of the senses their paths. United with the body, senses and mind is called the enjoyer, say the wise.

Completing the metaphor: the senses as horses that must be controlled.

Indriyāṇi hayāḥ — the senses are the horses. The five capacities of perception and action, restless as steeds.

Viṣayān teṣu gocarān — the objects are their fields of action. What the senses pursue: forms, sounds, tastes, etc.

Ātma-indriya-mano-yuktam — united with the body, senses and mind. The conditioned identification.

Bhoktā — the enjoyer, the experiencer. One who identifies with experience, who “consumes” sense objects.

Manīṣiṇaḥ — the wise, the reflective. Those who have analyzed this structure.

The problem: the horses (senses) pulling wildly after their objects, while the charioteer (buddhi) sleeps and the passenger (ātman) forgets his true nature.

Yoga is the training of the charioteer and the taming of the horses.