Love all of Nancy's suggestions for making sure you're eating enough salt, fat and food. I get the same muscle fatigue as you when I'm in induction. In fact, I only walked the first few months back on Atkins. No hill climbing until I had my eating way under control and had developed a good repertoire of low carb healthy fat meals. Give your body a chance to learn to burn fat instead of carbs for energy - it takes more time for some of us than others. And congrats on coming back to this wonderful woe after two years!