Fact 1: Exercise increases a body 's strength.

Fact 2: Isometric exercise is a sustained contraction of large muscles, such as weight lifting.

Given the two facts above, answer the question "Sustained contraction of large muscles in a body leads to what?" with the following options: 
- rapid expansion
 - increased body hair
 - prolactin release
 - recovery time from fatigue
 - increased IRA balance
 - increased pupil dilation
 - increased body strength
 - staying warm


 

       increased body strength  