Flexibility is one of the most important components of physical fitness. However it is usually forgotten,  not many people can actually do it. Its probably because there are no AMRAPs that say do as many splits as possible in 5 minutes! However a lack of flexibility can result in reduced performance. For example, if you lack flexibility in your lats, you may find it difficult to maintain a front rack position for your clean and jerk, thruster or front squat. Make sure you make some time to work on your flexibility,  it might determine your next PR.