1. EVERY ACTIVITY PRODUCES LACTIC ACID.
-Get over it, it does. It's simply fuel, very efficient fuel. Walking around produces lactic acid, running slowly produces lactic acid, running fast produces lactic acid.
These activities all produce different amounts of lactic acid. When the amount produced outpaces the amount that can be used, you're in trouble and will be limited by the substance.
2. Any lactic acid produced is gone within an hour.
-No matter how hard or fast you ran, it's back to normal levels very quickly.
3. Your muscles are suffering from micro-tearing that requires blood to be repaired, hence the swelling and discomfort.
-Ibuprofen (anti-inflamatories), easy running, and ice baths will help, that's it.