Give it a shot.

Don't pass judgment when you don't know them. Stop.

It's stereotypical to think a certain way of people. Mind you, it's either the influence of the media, the stories you hear, or (Yes, no doubt) first-hand experience. But. People can do better. One sister sucks at running, doesn't mean the other sucks at it, too. People can change. And do very well at it. As long as there's willpower or the occasional stimulant, you can attain your goals.

I think that there will be some point in life where something just changes you. A really strong drive that pushes you to excel and overcome.

Be it a job, family, death, a rare occurrence. It's like your subconscious mind suddenly overpowers the other part and Voila! You're a determined fella.

Support and believe in that fella and give him confidence to go on and reach for their goals.