I like the sentiment, but there's several factors here, including inherent "agility" and of course luck. I never broke a bone as a kid, and not only spent half

I like the sentiment, but there's several factors here, including inherent "agility" and of course luck. I never broke a bone as a kid, and not only spent half my youth outdoors but was a daredevil. Summer: Tree climbing, as high as 50'. Constant bike riding on and off road, skateboarding, go carts, dirt-bikes (hill climbs, jumps), jungle gym, stilts, pogo sticks, trampolines, swings, water-skiing, touch football, street hockey, basketball, and soccer. Winter: Flexible flyer sledding on steep hills with frequent collisions and wipe-outs (that was half the fun), snowmobiles, tubing, skiing, skitching (when streets are snowy/icy you hold on to a car's bumper and hitch a ride) One of my own kids has the daredevil streak also and built huge jumps for bikes in summer and snowboards in winter. They'd jump over cars. No broken bones (lacerations, bruises, sprains however) On the other hand, I saw a kid break his leg at 2 mph by falling off his bike against a curb.