Matt experiences a lot of post-exercise lows. The harder he exercises, the lower he goes. They are the types of lows that persist hour after hour. Perhaps the most interesting thing about this is that YOGA tends to cause lows as much as more "active" exercise. He was going low a lot over the past few weeks, and I assumed that he was still playing basketball in gym. Nope -- yoga. His blood sugar actually stayed lower following 45 minutes of yoga than it did following a day of skiing.