Most of those Olympians were putting in the hours for years. Many of them started pretty early on in their childhoods.
You’ll likely have friends with kids in the 8 – 12 year age range, perhaps taking classes for music or sports or dance. The instructors might throw in the conversation, “hey, little Jonny is good at this, and if he wants to get really good then in a year or two he needs to start putting in 8 – 12 hours per week with us”.
The parents will wrestle with the implications – financial, time, impact on family schedule, worries about burn out, impact on studies, and hopefully make a decision in the best interests of the child. In some cases both they and the child are delighted to go “all in” on their chosen endeavour, for others it’s not the right thing.
Disciple, today’s thought experiment: what’s the response if the children’s or youth pastor throws out the invitation, “hey, little Jonny has a real love for the Lord, this could really be developed, and we’d like to invite him to our school of ministry for 8 – 12 hours per week”?