EIGHT STAGES OF YOGA

Yoga is practiced in eight different stages:

1) Yama

2) Niyama

3) Āsana

4) Prāṇāyāma

5) Pratyāhāra

6) Dhāraṇā

7) Dhyāna

8) Samādhi

But in Kali Yuga, this system of attaining the lotus feet of the Lord, is highly impossible. Hence it is recommended to chant the holy names of the Lord, the Hare Krishna maha-mantra, for very easily and quickly attaining the shelter of the lotus feet of the Lord.

For more, refer Srimad-Bhagavatam 3.27.6