Why is Russian twist so hard?

Russian twists strengthen your core, obliques, and spine . “It’s a total core exercise that also works your balance, builds stability in your spine, and trims your mid-section all at once,” says Donohoe.25 Oca 2019

What are the main problems with this Russian Twist exercise? “The first issue is compression. Staying in that half sit-up position requires a massive contraction of the abdominals and hip flexors, which in turn produces excessive compression of the lumbar spine . “The second issue is flexion.

Russian twists target the following muscles: