If you read any article as to why you should be strengthening your core muscles, they will tell you the same thing:
- Weak core muscles contribute to lower back pain
- Injuries can be prevented with stronger core muscles
- Stronger core muscles will help greatly improve your sports performance.
- Just because you exercise doesn't mean you're necessarily strengthening your core muscles (or strengthening them properly)
Some articles you can read here, here, and here. But really, there are a ton of articles all over the Internet telling you the same thing, they are not hard to find if you just simply look.