2 Corinthians 5:12 ~ "We are not commending ourselves to you again but giving you cause to boast about us, so that you may be able to answer those who boast about outward appearance and not about what is in the heart."
Pride is at the root of every sin.
If you are going to have pride, take pride in the condition of you heart, soul, and spiritual life.
The body is more than a mannequin to show off material possessions and worldly status.
Roughly 1 minute considering verses of the Bible, and I, a dad, would explain them to my sons.