At age 74, late-bloomer Edwina Brocklesby became the oldest women in the U.K. to complete an Ironman triathlon. “I didn’t do any exercise at all until I was 50,” says Edwina, who was born in 1943. “One day, I went to see an old friend ... who was running a marathon. I thought that would be fun to do, at least a half marathon, anyway.” And so she did.
If you’ve been sedenta...