rectus abdominus strengthener.
But it’s far from functional, and for most people, far from what is needed for a healthy balanced body.
2. The plank is a multi-tasking move to flatten the belly without crunches.
Who does just one thing at a time in life anymore?
Why should your abs exercise be any different?
A crunch only works your abdominal wall, while a plank is a total body exercise that also engages your core (abs & lower back), helps better your posture, and works shoulder stabilization.
Plus, you never know when you are going to need to support your own weight and lift yourself off the floor.
3. The plank is better for your back and core.
A plank helps protect the back from problems that stem from sitting at a desk all day.
It strengthens the abs and core, while crunches exacerbate lower back issues.
Planks are ideal because they strengthen and stretch the body at the same time.
With a lengthened back and engaged glutes, you are able to integrate your core stabilizers which are critical for a healthy back and core.