Strength is a matter of the made-up mind.
Seek medical attention for any injury, discomfort or pain that you feel during or after activity. Always make sure your body is warmed up before you take part in any type of exercise or strenuous activity. Always stretch at the end of your warm-up and after you are finished exercising, to help prevent stiff and sore muscles. Never stretch a cold muscle, since it can lead to injuries. Therefore, the best time to work on improving your flexibility is at the end of your workout or after a thorough warm-up , when you are already very warm.