Replicate skin movement to rendering

Hi i’m trying to replicate skin being repeatedly targeted, similar to this part of the video (0:03 to 0:10)

I have a full body model i’ve already rigged, and a sphere to be the imitation “massage head”. Sphere physics is set to “collision”, and body is set to “soft body”, and I’ve also added the weight paint to it. I’ve also set the keyframes for colliding the sphere into the body’s shoulder.

Before I changed any of the “soft body” settings, the body would react when the sphere collides (albeit weirdly), but after i played around, nothing happens now. I haven’t touched the sphere settings at all. I’m not sure how to replicate the video, or if it’s possible.

Appreciate any help, and thank you!