Physical fitness makes you capable to do any thing or any work in life.
Physical fitness also makes you mentally fit.
Physical fitness makes you capable to do any thing or any work in life.
Physical fitness also makes you mentally fit.
I will speak in cliches, sorry about that.
Your body is your temple.
Healthy body, healthy mind.
Etc.
Basically, it's important. Of course, you might decide to not be exactly fit, but keeping it healthy is imperative.