What the mind of man can conceive and believe, it can achieve.
—Napoleon Hill, personal success author
Linda was the mom of twin girls who were volleyball players. At 14, they were playing on a new club team with other girls aged 15, 16, and 17. When Linda looked at the 10 members of the team lined up side by side, she noticed how thin her girls appeared. “My girls look like sticks compared to the other girls on the team!” she said. “I’m going to sign them up for some personal training so they’ll beef up.”
Whoa. Wait a minute. Linda didn’t understand how varied body shapes and sizes are during puberty. In fact, if you lined up 10 girls or boys in this age range, you would see what Linda saw: a ...