To improve your flexibility you must stretch major muscle groups on a daily basis. The stretch needs to be sustained for approx 30 secs without bouncing so that the muscle fibers are given enough time to adapt to the new length of the muscle. Major muscle groups get tight with poor posture, repetitive actions and lifestyle habits eg. sitting at computers. Common muscles that require stretching are hamstrings, quadriceps, calves, upper trapezius and the triceps.
Yoga and Pilates are excellent ways to improve your flexibility.