hello! which gym exercises are the best for sprinters? which muscles are the most important to train?

I’m a 16 yo swimmer, and my favourite and main distance is 100 backstroke. Now, I don’t improve my results. They are the same as they were a year ago. How do you think, how I can improve them? Maybe, you’ve had such a situation

27.33 50m free at 13 years and 35.44 50m breast

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