Rise in heat in northern India causing challenges in daily life. Muscle cramps, known as charley horses, are on the rise due to dehydration. These sudden, painful contractions occur in legs and calves. Rise in heat in northern India causing challenges in daily life. Muscle cramps, known as charley horses, are on the rise due to dehydration. These sudden, painful contractions occur in legs and calves. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle