It's Alex, writing because you've had a YogaTrail profile for a while now, but don't have any reviews yet.
Many yoga pros feel reluctant to "bother" their students with asking them for a review. But in our experience, we've never actually heard of any student getting annoyed... most are all to happy to leave a nice review for their yoga teacher or studio!
And asides from giving all other yogis out there a nice impression and a good idea about your classes, having some reviews will actually make your profile more visible on YogaTrail (that's to give site visitors a better experience — hope you understand).