Doing a ton of crunches is a sure fire way to enhance already bad posture and increase muscle balances and tightness in the anterior of your body. Not to say that crunches are all that bad, they have their place. But the crunch is overrated.
The plank, on the other hand, will help you build postural strength. This will lower your chance of lower back pain and also help contribute to more muscle balance throughout your body.
The video will show a correct way to do a crunch as well as a plank. Now start adding the plank to your workout and start eliminating the number of crunches you're doing.
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