The blender retopo lecture I'm following had me make extrusions from a shrinkwrapped 12-sided circle to cover this muscular arm.
For these protrusions, the instructor suggests insetting the faces to add topology and making adjustments.
Is this good practice, and should I be concerned with the non-flat poles it introduces? I'll be animating this model later, and there hasn't been much edge flow content so far beyond adding loop cuts at joints for cleaner deformation.