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bad posture is a great indicator of tight or weak muscles, especially with muscles like your hip flexors. if you have a job that requires you to sit for long periods of time it’s quite likely that you have tight hamstrings and hip flexors due to being in a sitting position all day.
+1 on this, all very true. Also, when one is involved in an athletic pursuit, whether is is shot putting, olympic lifting, powerlifting, football, or anything else. its fairly easy to see any weakpoint in strength or flexibility by simply watching them train and watching them do the various movements. Its only hard to spot these things when people stop using the body as a whole unit and start isolating. Then we have to resort to special tests.