Exercising core muscles safely

Exercising core muscles without proper technique risks compressing the spine, CBC's Kim Brunhuber reports.
Focusing on your core muscles is all the rage at gyms but experts are raising a red flag, CBC's Kim Brunhuber reports. 1:59

Focusing on the core muscles that support the back is all the rage at gyms, but an expert is raising a red flag.

Both traditional sit-ups and planks risk compressing the spine, says Dr. Stuart McGill, a professor of spine biomechanics at the University of Waterloo.

McGill shows a safer technique to CBC's Kim Brunhuber.