She asked today if she could play on the front with her bike. She is allowed because our road is a dead end so there isn't much traffic. But I told her if she waited for me we would both go into the park on our bikes.
After approx 10 mins she said "My legs are aching, I feel tired, can we sit down now?". She is only 6 I used to be able to ride for hours at that age. I'd have been out all day if I was allowed.
She eats healthily and is slim. We walk everywhere we go, so it had never occured to me that she might not be fit. But she doesn't really do any sports/activty since she quit dancing last year.