Why should you include weight training as part of your exercise routine? 1. to increase muscle mass
II. to increase bone density
III. to increase flexibility

1. to increase muscle mass

Explanation:

the reasonn why you should inckude something like weight routine in your life is mostly to increase muscle mass. but the truth is that your bone density also increases and your flexibility can also increase to a smaller amount. hope this helps!

need the chart. attach