Comment by mroset

She doesn't have very athletic parents, so she regularly exceeds my expectations for her, but she's not a particular standout otherwise!

Probably the more relevant factor: we replaced one of cars with a cargo bike when she was 15 months old, so she does 1500+ miles a year "on" a bike, and a tiny fraction of that in a car (we live in a totally car-centric US city, so this is pretty out of the norm). Bikes are the fabric of her daily life so she is really, really motivated to spend time on a bike.