If you are sprinting and lifting heavy on such low carbs and so early on in the transition, you may have a really really hard time. What I did was slow way down on my exercise. I went for leisurely 2-3 mile walks every day at lunch and hiking in the mountains on weekends. I found that I was much slower hiking in the mountains than usual. I used to be at the front of the pack but now was at the back and kind of struggling. Eventually once I got truly adapted I was back up front again. I really loved the ability to go for a strenuous hike totally fasted (with the exception of some coffee.)
Female, 5'3", 50, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 192.5lbs, press 75lbs and deadlift 210lbs