Thank you for using the site. I'll be happy to help you with your project. Can you provide any additional details or requirements?
Ok, thanks. I've seen this project several times before.
I have found that picking an Olympic sport is often the most direct approach to use, as the data is easily obtained and improvement over the years tends to be linear or close to linear. You can get data for summer and winter games events at the www.olympic.org website.
I'm not clear on how much assistance you are seeking here. Your original question said that you were "looking for ideas", and my best suggestion is to use some particular Olympic event, since actual data is available and easy to obtain. If you have the option of using mock data, then there are other things that you could explore.
If you're in need of further assistance regarding this project, please let me know. I'll be happy to help you with it, I just wasn't sure how much help you wanted and didn't want to go beyond your initial question without permission.