Alleviate stiff hips and tight hamstrings with these easy-to-master flexibility exercises. Not flexible? Follow along with this 30 day stretch routine designed to help increase flexibility in a safe way. Great for beginner's or anyone in need of a great stretch. Though flexibility exercises may not sound as exciting as a six-pack workout plan, flexibility is key to feeling mobile, agile, and strong in our bodies. Increasing your flexibility is right up there with cardiovascular health and strength training when it comes to staying fit and healthy.