FASTER, PLEASE: “Exercise-in-a-pill” boosts athletic endurance by 70 percent. “Mice in the control group could run about 160 minutes before exhaustion. Mice on the drug, however, could run about 270 minutes—about 70 percent longer. For both groups, exhaustion set in when blood sugar (glucose) dropped to around 70 mg/dl, suggesting that low glucose levels (hypoglycemia) are responsible for fatigue.”