[thrashh]

I haven’t used these but I can ask say from general experience is that you get injured when you do something outside your skill level. So sometimes you’ll hear about someone getting injured doing something but I find it to be a meaningless data point usually.

[MivLives]

There's also the accidents happen thing. Sometimes the wheel slips, sometimes you didn't quite think the crack was as offset, sometimes the wind blows unexpectedly and causes you to swerve. It's not just the people pushing it that get hurt though that is a lot of the injuries.