Spending several months on developing your flexibility and not being able to use it without a warm- up indicates either that the stretching method you use is incorrect, you are chronically fatigued, or both. Training loads that are too great and not enough rest. If you begin your workout still fatigued or even sore after the previous one, you are asking for an injury, or at least you hamper your further progress. The wrong sequence of efforts. Never do static stretches before dynamic stretches, kicking, or any other dynamic movements.
Static stretches reduce the force production of the stretched muscles.
If you try to make a fast, dynamic movement immediately after a static stretch, you may injure the stretched muscle. In choosing stretches, you should examine your needs and the requirements of your activity. For example, if you are a kicker, you need mostly a dynamic flexibility of hips. To increase your range of motion, you need to do dynamic leg raises in all directions. A common sight in training halls, gyms, dojang, or dojo, is someone standing and holding up the leg.