Seventy-year-old Edna had never exercised much. After her doctor explained about muscle mass decline, she decided to enroll in a senior aerobics class. A year later, some of her muscle weakness appeared to have reversed itself, demonstrating

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Edna's improvement in muscle strength demonstrates plasticity, which refers to the ability of the brain and body to adapt and change in response to new experiences, learning, or recovery from injury. In this context, it shows that even at an advanced age, the body can still adapt and improve its physical condition through exercise.

Seventy-Year-Old Edna Had Never Exercised Much