03/17/2015 10:54 am ET

The Benefits Of Pumping Iron Later In Life

Robert Daly via Getty Images

When he hit 50, Tim Carrigan’s lower back started hurting so badly he could barely walk.

The injury, which dated to a childhood accident, had caused only occasional pain until Mr. Carrigan lost muscle tone with age. The pain dogged him for several years, but last year the Quincy, Mass., insurance-company treasurer started strength training twice a week on a circuit of a dozen machines.

Read more on The Wall Street Journal