A fellow gym-goer caught Amanda Bynes working out and uploaded this video to Facebook. So here it is.
Via: celob.com
According to the Facebook thread about the video, Amanda was in flip-flops and wearing sunglasses.
But don't forget that different form doesn't mean she's not getting in a good workout. Just look at Phoebe!
Update: The video was originally posted to Facebook, but has since been taken down. The above is a YouTube version.