Striking a pose is good for muscles and brains, scientists say. Older Americans, ages 55 to 70, improved their information recall, mental flexibility and multitasking by practicing hatha yoga three times a week, according to new research. The control group did general toning exercises but showed little cognitive improvement. Researchers theorize that yoga’s breathing techniques may reduce stress, which could be key to boosting brain function. While the young tend to enjoy more yoga, it’s no stretch to say that over-50s should give it a try.