Crunches were once the answer to sit-ups, the gym warm-up of our elementary school days. Now both abdominal exercises have a bad rap in the fitness community. The repetitive flexing of the lumbar spine, or lower back, has been implicated in back injuries as serious as disc hernias. The following exercises can help flatten your belly while minimizing pain.
from Reader's Digest http://ift.tt/2cvDWtP
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