First experience

This blog started at the request of a user here. I will update with subsequent uses. The first which was posted elsewhere is posted below.

I just got my MGX yesterday and used it for the first time this morning. I prepped and lubed like the instructions said. I laid on my stomach, one leg bent and relaxed. I wasn't expecting anything to happen right away, as I understander there is a "learning curve" and just relaxed. Then I started "flexing" and within minutes I was jerking and bucking like I was having a seizure. Is it common to feel this so soon?