Fact 1: Exercise increases a body 's strength.

Fact 2: Strength training is also effective for increasing bone strength in older adults.

Given the two facts above, answer the question "A good way for older adults to strengthen bones is to " with the following options: 
- Through play
 - drive more slowly
 - exercise
 - use a hearing aid
 - quadriceps
 - donate bone marrow
 - sweating
 - movement


 

   exercise      