Yoga literally means "yoke" and the practice of yoga yokes the finite you to the infinite you. All branches of yoga accomplish this, but Kundalini yoga works fastest. That is why it has been known as the householder’s yoga. You don’t have to go to an ashram and study for years to reach enlightenment; you can reach enlightenment while you have a job and kids and social interactions and all of the busyness of our times just by doing Kundalini yoga. It’s fastest because it integrates asana (posture), pranayam (breath), mantra (sound), and meditation.
The exercises are simple and can be modified for all levels of fitness. Even if you are not looking to reach enlightenment, this yoga will bring you an excellent level of fitness and flexibility. As the yogis say, "you are as young as your spine is flexible."