My First Cantatamaths Exhibition Entry

This year we entered in the Cantamaths exhibition. I was doing my Cantamaths on world record Olympians. I chose 5 sports and I did: 200m sprints, cycling, shot put,High jump and long jump. I found it interesting that the times were getting faster and faster. Is this because:

1. People are training harder and differently?
2. Because the bikes could of changed?
3. Do the coaches know more about the sports?

What I found hard was finding the information on the iPad. I really enjoyed making my book.