Sign up for Life Kit’s Guide to Building Strength, a free, month-long newsletter to help you start a lasting workout routine at NPR.org/StrongerIG.⁠ ⁠ What might you get out of it? Resistance training strengthens your bones, reduces chronic pain and bolsters the immune system. There’s accumulating evidence on how it changes your brain, preserving cognitive function and guarding against age-related diseases like dementia. And the list goes on and on.⁠ ⁠ Brad Schoenfeld, one of the top scientists