Is a little in and out movement on the rear axle normal?

A small amount of in-and-out movement on the rear axle is normal and expected. This is due to the design of the rear suspension, which allows the axle to move slightly in order to absorb bumps and vibrations from the road. However, if you notice excessive movement or play in the rear axle, this could indicate a problem with the suspension or axle components and should be inspected by a qualified mechanic.