I found last night’s (in the UK time) vibrato lesson really useful and fun. I did Jason’s first vibrato lesson a few weeks back & discovered that I couldn’t get the wrist movement whilst holding the fiddle so I wondered if there was something wrong with my hold position. I looked up one of the early modules of how to hold the fiddle & sure enough I was holding the neck between my thumb and hand without a little v-shape gap. So I changed my hold & then also heard a tip from a classical player whose teacher made her practice scales whilst wiggling her thumb thereby releasing any tension in the grip. Both of these adjustments really help & I now get a bit more movement in the wrist. It was interesting & reassuring to hear so many others have the same issues, I thought it was just me!