How Much Will Exercise
Lower Your Blood Sugar?

Yes. Aerobic exercise (walking, cycling, swimming) causes muscles to use glucose for energy, which lowers blood sugar during and after exercise. The glucose-lowering effect can last 24–48 hours after intense exercise. This is why regular exercise is one of the most effective tools for managing type 2 diabetes.

30 minutes of brisk walking typically lowers blood sugar by 20–40 mg/dL (1.1–2.2 mmol/L) in people with diabetes. The exact drop depends on your starting blood sugar level, insulin on board, fitness level, meal timing, and how recently you ate. Always check before and after.

If your blood sugar is below 126 mg/dL (7.0 mmol/L) before moderate or vigorous exercise, most guidelines recommend eating 15–30g of carbohydrates to prevent hypoglycemia. If it is above 180 mg/dL (10.0 mmol/L), exercise can help bring it down without needing extra carbs first — but avoid exercise if above 250 mg/dL with ketones.

Yes. Intense anaerobic exercise (sprinting, heavy weightlifting, HIIT) can temporarily raise blood sugar because stress hormones like adrenaline trigger the liver to release glucose. This spike is usually followed by a larger drop several hours later. This is why the tool marks HIIT and sprinting as having a "mixed" effect.

Brisk walking, cycling, swimming and dancing are among the most effective aerobic exercises for lowering blood sugar. Research shows that a combination of aerobic and resistance training (weights) provides the greatest long-term benefit. Even a 10-minute walk after a meal can significantly reduce post-meal blood sugar spikes.