In today's session I experienced sensations that felt like a series of very very mild shocks through the core of my body. Calling them shocks is probably too extreme, but it's the closest way I can think of to explain it. A buzzing vibration is maybe another way. Each time it was for about 5 to 10 seconds, followed by a break, and it happened 3 times with a few minor tremors in the arms in between. At the end there was a feeling of renewed calm and completion.