During and after activity, your muscles take up glucose more readily, which generally lowers blood sugar and improves insulin sensitivity. Regular movement, including walking, is one of the most effective lifestyle tools for managing type 2 diabetes and prediabetes.
The glucose-lowering effect can continue for many hours after exercise, sometimes into the night. For people on insulin or sulfonylurea-type medicines, this means exercise can trigger a hypo, sometimes hours later, so checking before, during, and after activity is wise.
Very high blood sugar with ketones is a situation where vigorous exercise may not be advised. Carry fast-acting sugar when active if you are at risk of lows, stay hydrated, and discuss an activity plan with your care team, especially before starting something new or intense.