Because that's how strength is built.
Your body adapts by being asked to do the same thing repeatedly — and then being asked to do it a little harder. That process requires consistency with your movements. Changing exercises too frequently prevents your body from ever fully adapting to them, which means you never build real strength in anything.
The repetition is the point. Every time you return to a squat, a hinge, or a push, your nervous system gets more efficient at recruiting the right muscles, your joints build stability, and your technique improves. That's not monotony — that's mastery. And mastery is what makes movement feel easier, safer, and stronger over time.
Think of it like learning an instrument. You don't build skill by playing a different song every day.