I see it with my kids as well. My older daughter is very lean and had long legs. She is incredibly fast and was the 2nd highest rated running in her age group in our city of 2 million this year. She can not run for a week and then go out to a track meet, warm up for 5 mins and win it. Her younger sister is short, a tiny bit pudgy and has shorter legs. She’ll work 10x harder than her sister and still finish like 15th.
I see it with my kids as well. My older daughter is very lean and had long legs. She is incredibly fast and was the 2nd highest rated running in her age group in our city of 2 million this year. She can not run for a week and then go out to a track meet, warm up for 5 mins and win it. Her younger sister is short, a tiny bit pudgy and has shorter legs. She’ll work 10x harder than her sister and still finish like 15th.