When I was 18, I had started to teach aerobics classes at my local gym, and I remember telling my parents that I wanted to be a “career” aerobics instructor, and that I wasn’t too keen on going to college. My mom said, “That’s ridiculous,” and immediately denounced the notion. My Dad gave it a bit more thought but ultimately said, “That’d be like digging ditches all day, Ellen.” He was worried about the toll...