Soil compaction is often the product of heavy foot traffic on your lawn. As a result, air, nutrients, and moisture have difficulty reaching grass roots, causing your lawn to struggle to thrive. To alleviate soil compaction, rent or buy a mechanical aerating machine. It pulls plugs of soil to the surface, enabling water, air, and nutrients to make their way easily to the roots of your lawn. And don’t worry about raking up the plugs. Leave them, and in a couple weeks, rain and foot traffic will break them down, allowing them to be re-absorbed back into the lawn.