Aside from strengthening the core and posture-improving effects of the planks, it also helps reduce back pain. Planks provide relief by increasing our awareness of spinal alignment and posture, meaning to say that if makes us wary of how to hold our bodies (postural awareness).

Having good posture helps us keep safe because we are properly distributing our weight during planks. Moreover, by doing the planks more often or at least practicing it consistenly helps us avoid doing awkward and incorrect movements that may lead to injury and pain.

When we do the planks we're forced to keep our weight balanced all over our body to prevent injury, but we use our toes and arms to hold up our weight. The benefit of doing planks is that it can be modified in ways that we can learn how to balance ourselves better.

The classic plank actually lengthens and stretches our hamstrings, even though it doesn't feel like a typical stretch.

Planks also stretches the arches and balls our our feet that furthers improves our balance and range of motion, while side plank stretches our obliques which makes our trunk easier to rotate.