Why should you include weight training as part of your exercise routine? i. to increase muscle mass ii. to increase bone density iii. to increase flexibility

I. to increase muscle mass

II. to increase bone density

Explanation:

Weight lifting is able to increase lean muscle mass and bone density.

Increasing muscle mass through weight lifting will not only contribute to your metabolism but will transform your fitness. Plus lifting weights allows you to focus your workout on specific body areas. Cardio training helps you lose weight plus will burn fat and muscle, while creating more muscle will cause your metabolism to burn more fat than muscle.

In addition, science has already proven that physical inactivity decreases bone health, and studies show that resistance training provided by weightlifting provides the important mechanical load to improve and increase bone density.

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;