Assuming arguendo that you're not talking about repetitive stress injuries to the body or brain from overdoing physical or stressful activity, and just the acut

Assuming arguendo that you're not talking about repetitive stress injuries to the body or brain from overdoing physical or stressful activity, and just the acute harm from accidents, they're pretty much the same as driving. The correlation to accidents does not mean the activity is dangerous: it's the accident that's dangerous. I object to the conflation of quantitative risk of experiencing an incidental event with the qualitative risk posed by a voluntary event.