For most of my adult life, I have gone to the gym at least several times a week. I have always believed in exercise, especially after one of the tattooed trainers at the gym instructed me that by age 40, a woman must exercise vigorously for one hour a day not to gain weight.

Think about that and what it means for a woman in her 60s like me, for example. In order not to gain weight, I should be working out vigorously for one hour every 10 minutes.