You can work out while you are on keto, but you may have to change your approach at first.
By restricting carbs, you will also be starving your body of its only fuel source for high-intensity activities that last longer than about 30 seconds.
This means that your performance in most sports, exercise classes, and weight training programs will suffer when you first start keto dieting.
After a couple of months, however, your body will become keto-adapted, which means that it will be much better at burning ketones for fuel and keeping your glycogen (storage form sugar) stocked for high-intensity activity. The only problem is that any high-intensity exercise that lasts longer than about an hour will typically drain glycogen stores, and keto dieters will experience drops in performance as a result.
With that being said, you can still exercise while you are on the ketogenic diet. In fact, you will be much healthier, happier, and get better results if you do exercise. You may just have to make some adjustments to your workout plan.
For more information on how to work out on keto, read through our guide to keto and exercise. Whether you are a high-level athlete or you just want to stay active for health reasons, this guide is filled with information and strategies for you.