Exercise your brain.Regularly exercising the brain keeps it growing and stimulates the development of new nerve connections that can help improve memory.By practising new mental skills—such as learning a new language or learning to play a new musical instrument—and challenging your brain with puzzles and games，you can ________.

　　Exercise daily.Regular aerobic(有氧健身的)exercise improves circulation and efficiency throughout the body—including the brain—and can help avoid the memory loss that comes with aging.Exercise also makes you more alert and relaxed，and can thereby improve your memory uptake.

　　Reduce stress.Stress does in fact physically damage the brain；it can make remembering much more difficult.Try to relax，regularly practice yoga or other stretching exercises，and see a doctor if you have severe chronic stress as soon as possible.

　　Eat well and eat right.There_are_a_lot_of_herbal_medicines_on_the_market_that_

　　claim_to_improve_memory，but_almost_none_have_yet_been_shown_to_be_effective_by_experts_in_this_field.A healthy diet，however，contributes to a healthy brain，and foods containing antioxidants(抗氧化剂)—broccoli，blueberries and berries appear to promote healthy brain function.

　　．What is the main idea of the text？(no more than 8 words)

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