Based on which experience? My experience with now 2 young kids and their playground buddies is that whichever skills they regularly practice improve very dramatically compared to skills they don’t practice. The differences are not at all subtle.

If you get a few 3-year-olds and e.g. get one to practice kicking a ball for 10 minutes per day, another to practice riding a 2-wheeled scooter, another to practice hanging from monkey bars, and another to practice swimming, after a few months there will be a wide gulf between their abilities at those skills.