The crunch is a dynamic movement. It’s a spinal flexion – a forward bend of the spine. The plank is a static hold. An isometric contraction of the muscles of the spine .
What is the difference between a front plank and a crunch?
The crunch is a dynamic movement. It’s a spinal flexion – a forward bend of the spine. The plank is a static hold. An isometric contraction of the muscles of the spine .