They said it wouldn't change anything. but 100 push-ups a day… changed everything.

What Happens If You Do 100 Push-Ups Every Day for 90 Days – The Discipline Challenge
Most people won’t make it past Day 3.
Not because their body gives out, but because their mind does.
You want to change your life?
Start by doing 100 push-ups. Every. Single. Day.
No excuses. No gym. Just you, your breath, and gravity.
Do this for 90 days, and I promise you won’t just look different.
You’ll become different.