Kundalini yoga is a flawed concept not promoted by Indian spirituality. Nowhere in Bhagavad Gita Kundalini is equated to physical aspect of yoga called asanas (yogic exercises).
Serious travelers of spiritual path, seekers clearly understand that activation of kundalini is possible only by covering the inner journey. Any external stimuli on path of kundalini awakening were not necessitated. Full awakening of the kundalini occurs when human beings indulged in absolute celibacy for a minimum period of 12 years in continuation.
Kundalini, the dormant cosmic energy lying in base of spine is activated when we followed principles of spirituality as laid in Bhagavad Gita and Upanishads (independent spiritual treatises). To activate kundalini shakti one needs following path of spirituality never religion (path of rituals). To gain purity as a soul atman our establishing absolute control over five senses and mind is required. Indulging in contemplation (chintan) most of time we can eradicate dross impurities within. Demolishing queries within one by one is what spirituality all about.
Practitioners of kundalini yoga understood nothing about Kundalini. If we seriously desire activation of kundalini we must follow precepts of spirituality detailed in Bhagavad Gita only. Activation of kundalini directly relates to spiritual journey. Everything gained on spiritual path while indulging in kundalini was one-sided, could never be reverted back. We must indulge in kundalini awakening only if we desire to reach god in present life time. Not in thousands but millions of people world over indulged in kundalini awakening only to quit midway.
Most became serious patients of depression. Reason, they could not control the partial activated kundalini. We can indulge in various types of asanas (yogic exercises) but not with a spiritual bent of mind. If we do that, we just could not quit the spiritual journey midway. Spirituality is always a journey into the unknown. Spiritual journey can be conducted in any posture. Even while working in office, jogging, swimming, walking… even sleeping one can indulge in spiritual journey.
Contemplation (chintan) can be indulged at any stage of life. We do not need an instructor to guide us in the spiritual journey of life. Prime reason why most spiritual travelers were introverts of the highest order.
I again emphasize, before indulging in kundalini yoga think twice as everything relating to spirituality including kundalini awakening is accomplished through the inner journey.
By following teachings of Sri Ramakrishna Paramhansa and Maharshi Ramana, we can clearly understand the path that need to be followed for full awakening of kundalini shakti. These two spiritual stalwarts not only succeeded in full awakening of kundalini shakti but also reached state of enlightenment in their lifetime.
The word yoga stems from the root word yog which in Hindi means the effort of soul atman wanting to synthesize merge with God Almighty permanently. Any kind of yoga that promotes journey towards god is the right kind of yoga indulged by human beings.