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Answer: It's common for hands to balloon, especially during longer workouts, but it's nothing to worry about, says Carl "Chip" Lavie, MD, director of the Exercise Laboratories at Ochsner Clinic Foundation in New Orleans.
Why? The puffiness is from blood pooling in your hands, which hang lower than your heart and are not engaged in muscular activity, says Dr. Lavie.
Originally published in Fitness magazine, May 2006.