I am filming gymnastics in a not so brightly lit gymnasium tomorrow and was looking for some advice on what settings would be best to use on my A1u.
Any help would be appreciated.

Well I guess I have to look elsewhere for some answers. This seems to be a pretty quiet forum.

Yep...sure is...on a weekend with only 12 hours between your initial post on a Friday night, and Sat morning. <sarcasm off>
Set your cam for Beach/Ski, and let it do the work if you're not wanting to be fiddling with exposure the entire time. If it's really not too bright, the cam will likely add gain, which results in a bit of noise.