I used to get a lot of medals during my swim team years.
Good job on your medals!
Throughout my years, I learned that stretching was a BIG part of swimming.
You might think you stretch, but I don't think you do.
1. Strectch before you even get into the car or bus to where you are going.
2. Strectch before you change.
3. Strectch right before you warm up.
4. Strectch anytime BETWEEN heats.
5. And last but NOT least, stretch after you're all done.
This will help you A LOT! I promise. And you have to strectch for more than 20s during the day, or its not going to help.
You're performance will also benefit.