Chianti

Hello! I compete in agility with a beagle - she is my first dog and there is so much I still need to learn about this beautiful sport. We are starting to develop a problem. She has always been pretty focused on me and my directions. But lately we've been working a lot on gaining speed and as she started to run ahead of me, she is paying less attention to the directions. She started barking like crazy and I can see that she is having so much fun, but her barking is so loud that I don't even know if she hears me. My trainer said I should be really happy that she is faster and focus more on my body language because sometimes my signals are not clear enough. I was wondering if any of you knows any ground work exercises I could do to improve my body language on course?

Thank you for your help,
Chianti