Static stretching is popular, but people rarely do it correctly, for static stretching to work, you need to hold a stretch for 2 to 5 minutes, this allows the nervous system to relax, which allows muscle tissue to gradually lengthen as your nervous systems acclimates to the muscle being stretched.
This takes at least two minutes, possibly longer if you are exceptionally stiff, holding a stretch for 30 seconds is not going to have any real benefit.
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