Egbu draws stuff!

[Samszym]

I'll try and focus on the the connection, I think it is called the obliques

I don't think that would be going about it right, try instead to draw the form of the torso and pelvis as simply as you can. Drawing the rib cage and pelvis as two boxes is a fantastic exercise because it forces you to decide what part is closer to and further away from the viewer. Getting those two forms to go in the correct direction in space is key to figuring out their relationship, not being familiar with the anatomy of the midsection.