Oh, yeah. Forgot the "spraining an ankle" thing. Out of like 3 people I know who did Spartan style races, at least two of them did like ACL/MCL tears. Maybe an Achilles? We're talking major surgery plus months of recovery.
Tiny sample. These were definitely people with more enthusiasm than training, so maybe any high intensity exercise would have done this to them.
I do 6000 miles a year on my bike. Most of the people I ride with do 10K to 15K miles/year. Out of a group of 30+, one banged up arm in a crash. I know
of a guy with a concussion, but that moves the sample size up to 100's of cyclists. Let's say in my group of 30 there's a couple hundred thousand miles of cycling. You're collectively talking a week or two of missed training time to injury, and that's rounding up. That's relatively common that a group of cyclists has much less time missed due to injury than runners -- nearly every runner I know misses time every season due to injury. Spartan racing? I'm assuming more injuries than training for marathons or half marathons, but clearly I don't know enough people who do it.
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Can still get hit by a car when running, imo.
I'd guess in your "hit by car doing training per 100's of hour" or metric like, that running is safer than cycling. However, getting hit by a car is a once in a few 100,000 miles sort of thing on a bike. I'd guess you'd wreck a bike with road rash or worse every 1000 hours or so, assuming you don't like do tough mountain biking. I've crashed 3 times in the last two years, One was a once in 10 year pack riding thing. Two were me riding tough off road trails and not being as expert as the route I chose.
If you're a trail/path runner, you may never come near a car to get hit. I assume Kerowo isn't in jeopardy, running in parks. Or the risk of driving to get to the workout is far more risky than doing it.