The problem with exercising exclusively for how you look without addressing how you function, is it’s not sustainable.
Just like a car that isn’t working, a new coat of paint won’t fix the problem under the hood.
The new paint job will make it look good, but eventually it will break down and you’ll have to admire the paint job without using the car.
Eventually the new paint job will rust because you’ll neglect the car that you can’t drive.
Just like a body that “looks good” but you can’t do anything with it. The looks you busted your butt for will fade because your body is in too much pain, injured, and broken to actually put in the work to keep your body looking good.
If you pursue functional mechanics when you exercise, the exercise will carry over long after you’re done working out. Your body will feel good, you’ll be able to move well, and your body will look good as a result of proper training. Training that is sustainable and supports the complexities of the human body.