Flexibility

Definition: Flexibility is the range of motion in a joint or group of joints, or, the ability to move joints effectively. Flexibility is related to muscle strength
http://worklifefit.com/blog/2011/11/role-of-hr-and-flexibility-survey-help-me-prep-for-my-fwishrm-session/
When talking about the benefits of exercise, keeping the heart and blood vessels healthy usually gets most of the attention. For many individuals, though, stretching and strength training exercises that barely raise the heart rate and so aren’t considered moderate at all may be just as important.

You have to be Flexibility of doing something.where it get to be easy to do it.
(RealSimple.com) -- You've managed to make it to spinning class (for the second time this week!), but as soon as the instructor starts the cooldown, you head for the door. Hold it right there. Turns out, stretching is just as important as getting on the bike in the first place.
Although countless studies have shown how beneficial exercise is for your body and mind (it may do everything from reducing the risk of some cancers to helping improve memory), less attention has been paid to flexibility.
http://www.cnn.com/2010/HEALTH/08/21/increase.flexibility.realsimple/index.html