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There seems to be a lot of buzz in the fitness community recently about how situps and crunches are bad for people's backs.

For example, Harvard Medical School makemakes the claim is made, but they don't cite any scientific studies.

One reason is that sit-ups are hard on your back — by pushing your curved spine against the floor and by working your hip flexors, the muscles that run from the thighs to the lumbar vertebrae in the lower back. When hip flexors are too strong or too tight, they tug on the lower spine which can be a source of lower back discomfort.

Is there any evidence that doing crunches or situps to exercise abdominal muscles is harmful to the lower back?

There seems to be a lot of buzz in the fitness community recently about how situps and crunches are bad for people's backs.

For example, Harvard Medical School make the claim is made but they don't cite any scientific studies.

One reason is that sit-ups are hard on your back — by pushing your curved spine against the floor and by working your hip flexors, the muscles that run from the thighs to the lumbar vertebrae in the lower back. When hip flexors are too strong or too tight, they tug on the lower spine which can be a source of lower back discomfort.

Is there any evidence that doing crunches or situps to exercise abdominal muscles is harmful to the lower back?

There seems to be a lot of buzz in the fitness community recently about how situps and crunches are bad for people's backs.

For example, Harvard Medical School makes the claim, but they don't cite any scientific studies.

One reason is that sit-ups are hard on your back — by pushing your curved spine against the floor and by working your hip flexors, the muscles that run from the thighs to the lumbar vertebrae in the lower back. When hip flexors are too strong or too tight, they tug on the lower spine which can be a source of lower back discomfort.

Is there any evidence that doing crunches or situps to exercise abdominal muscles is harmful to the lower back?

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Are Do situps and crunches harmful to the bodycause lower-back pain?

3 the question is more general
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Do Are situps and crunches cause lower-back pain?harmful to the body

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2 Focussed question on cited claim.
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