Blood sugar levels can rise after exercise for a few reasons:

1. Hormonal Release: When you exercise, your body releases hormones like adrenaline and cortisol, which can cause your liver to release more glucose into the bloodstream.

2. Energy Supply: During intense workouts, your muscles need quick energy. If your body runs out of glucose, it can release stored glucose to provide energy, which raises blood sugar levels.

3. Post-Exercise Recovery: After you finish exercising, your body is busy repairing muscle tissue and replenishing energy stores. This process can also cause a temporary increase in blood sugar.

Remember, while short-term increases in blood sugar are normal, your body typically regulates it efficiently afterward. If you have concerns about blood sugar levels, consulting a healthcare provider is a good idea.