I like sport since I was very young, I spent my whole life in some kind of sport activity, I wasn't fan of team sports but in solo game I'm doing my best.
The thing i find myself most in is fitness, I have to be honest I never train continuously for longer period but whenever i catch some free time i go to gym or exercise at home ot just went outside for long walk or jogging.
I feel much better after exercising and it keeps me out of stress and keeps my mind clean.
But if you want better results if you want to achieve something more... than it is not just about training, it is much more.
I can compare it to life, if you do your regular everyday activity with no extra effort you will stagnate or even worse, you could go backwards. But if you giving your best and every day you go just 1 step more than yesterday, you will reach something only some of our kind did.
If you go hard on yourself and if you suffer like only few percent of people do, you will be on the top, you will be in the top few percentage of people.
As I said before that rule doesn't apply only in fitness, we can use it in anything on this planet. If you want to be best cook you must work harder than the best, if you wanna be the best singer you must practice more than your full potential, you must break the limit.
And very important thing, never get demotivated if you fall, if you go down after hard work.
All you need to do is take a deep breath, rest for a bit and keep going.