Best Lens to Rent for Gymnastics Photography?

[Christie]

I've asked this a lot of times before, but this situation has different circumstances haha I will be at my own gym taking pictures of my team as they compete. I will be allowed on the floor because it's a home meet that we are hosting, but there is NO FLASH allowed. I currently have a Canon EOS Rebel T1i and would like to know any recommendations as to what lens would work best, under poor lighting, but with the capability to capture fast movement WITHOUT blur... I am a poor college student so I cant really afford to purchase a lens, but I go to PennCamera to rent lenses, so here is a list of the lenses available: http://www.penncamera.com/files/tysons_rentals.pdf (its on page 7) Please let me know what you all think I should rent for the weekend, and also what you could recommend for shooting random things around DC, the Inner Harbor, and any tips you may have for capturing the best photos at the gymnastics competition. Thank you in advance!