It's always been a suggestion that if you want to help with digestion (or just get over that bloat of eating way too much) that you take a quick walk around the block. As an article in the New York Times points out, there's actually science to back up the benefits.
Two different studies have shown that a post-meal walk can aid in digestion. One study in 2008 showed that walking sped up the rate at which food moved through the stomach. Other studies have shown that walking also decreases blood sugar after meals, which decreases your risk for cardiovascular disease and diabetes.
Essentially, walking after a meal clears glucose from the bloodstream to lower blood sugar, and helps move food through your system quicker. So that old suggestion to take a walk after a meal really is beneficial.
Really? The Claim: Taking a Walk After a Meal Aids Digestion [New York Times]