May I add, one thing that is common in our culture is called "anterior dominance" - that is, too much activation of the muscles on the front of the body (tightness, etc, due to overuse, emotional tension and poor posture) and not enough activation of the muscles on the back of the body. The correction is to rebalance it - increase the exercises that use the muscles on the back of the body (glutes, hamstrings, back muscles - including the small stabiliser muscles of the spine, etc). I hope you agree Kit. Please let me know if you dont.
I was put on to this when two of my students had reported pulled hamstrings from doing very simple things, and got me reading up why it might have happened. After that, my classes always included exercises for activating the posterior muscular chains of the body.
Jim.