A shade tree mechanic will tell you, “ If the parts wear together you need to replace them together” even if one part still seems fine. It is because chances are the other part was compensating for the weakness of the other part before that part broke. That compensation could have weakened or increased the wear and tear on the part that didn't break and shorten it's life. It's not so different with the human body.

4. A shade tree mechanic will tell you, “ If
the parts wear together you need to
replace them together” even if one part
still seems fine. It is because chances
are the other part was compensating for
the weakness of the other part before
that part broke. That compensation
could have weakened or increased the
wear and tear on the part that didn't
break and shorten it's life. It's not so
different with the human body

6. One part of your body may be causing you
pain but the human body is a very well
balanced vehicle. If your low back is hurting
the cause might be something else. In the case
of your low back you might wake up and it's
just another day, and swinging your legs off
the bed, instantly you feel your low back
aches, or later on you reach to lift something
and there it is, that low back pain (often
excruciating) and tightness again. You didn't
do anything to cause it. It just happened.

8. Everyone will tell you, you need to strengthen your core
and stretch to get rid of low back pain. While weak
abdominal muscles are typically a contributor, there are
other lessor known culprits; the hamstrings. They can
reek havoc on your low back and your buns of steel, the
glutes. The hamstrings are the group of three muscles
located in the back of the thigh. The hamstrings attach
to the bottom of your pelvic bones. If they get too tight
they can pull down on the pelvis and increase the work
for the pelvic muscles and low back. Normal activities
rarely give that group of muscles the type of stretching
they need to keep them from getting overly tight.

11. So what causes tight hamstrings? Well, typically, weak
abdominals, (just like everyone assumed) caused your low back
pain as well as tight hamstrings which in turn aided in causing
your low back pain. See the cycle here? Or There are even more
probable causes. Remember the shade tree mechanic? Poor
posture, compensating changes in how you hold yourself due to
pain in another part of your body can cause weakness or
stiffness or over work in other areas of the body. The weakness
of other muscles or another movement related issues can
change the stress on the hamstrings. For example: The flexor
muscles at the front of the hips can also contribute to the
tightening of the hamstrings. And...if your gluteal muscles aren't
really buns of steel, those weak muscles can contribute to the
tight hamstrings and low back pain as well. Everything is related.

14. Stretching the hamstrings on a regular basis
can help keep both this group of muscles of
the low back, the glutes and even sciatica pain
from ruining your day. Stretching will reduce
tightness and keep you healthy. The stretches
should be used to reeducate and elongate the
hamstrings.
As always see a physician before trying any
exercise or stretching program. The sciatic
nerve can be irritated by some stretches