The Foundation of Yoga Practice

Kriya Yoga(Yoga of action):

It should be performed daily.

Patanjali states that:

Kriya Yoga contains Tapas, Svadhyaya, and Isvarapranidhana.

Tapas(austerity):
Through physical discipline (asana, pranayama, and meditation), conquer all physiological and psychological dualistic conditions: e.g. heat and cold, like and dislike, comfort and discomfort. Continual practice is the key to success.

Svadhyaya(the study of sacred scriptures):
Deepens one's understanding of the Truth.

Isvarapranidhana(faith and commitment to a personal god): pure devotion to a personal god, or pure faith; the vow to realize the Truth.