The shadows are different and the back foot is higher.
Mathschick - I have four girls. My eldest is 9. She's as thin as a rake, a highly strung and sensitive girl who over thinks everything. We started running 2 years ago cos she is also high energy and wanted to run. She can be fast, but doesn't have much mental strength. However she talks about running in the Olympics all the time.
My twins are 8 (16mths between the three). It's the eldest twin who runs. She has a slightly chunkier form and is not a natural runner and has had to work quite hard to get up to 5k. But now she has, she loves it. She is mentally much stronger than my eldest and once she decides to do something will persevere.
They don't really compete with each other at parkrun. My big girl is fastest and over 1 mile can get a good time. But neither of them like running 5k on their own, so the 3 of us run it together 
It's becoming what we 'do'. And it is wonderful - we are building such fantastic memories and I love it. Next week I am race director and the girls will either help out with the tokens or might run with another lady we've become friendly with and goes the same pace.
My younger twin and 4yr old Smidge come along to cheer and help with the tokens. They are very much part of the parkrun family as is my hubby who puffs along at the very back and sometimes manages 1 1/2 miles.
