You are presented with the question "What helps increase flexibility and muscle tone?" and the following answer choices: 
- movement
 - hydration
 - fitness membership
 - fats
 - hypertrophy
 - arteries
 - exercise
 - Proteins

Now knowing that exercise increases a body 's strength and strength is balanced with flexibility and all systems of the body are toned, choose the best answer.


 

       exercise  