"Don't tell me what to do"-ism?

Yeah, I just don't get how "sitting in a 5 foot diameter tube for 24 hours looking through a tiny window" is exploring. You didn't make the project happen in any meaningful way - you're just a passenger. Seems like a pretty terrible way to pass the time, even when everything works as expected.

I can kind of see the appeal of Everest from a mountain climbing point of view, but I think I'd go and do one of the peaks without rush hour queues. So what if it's the 2nd/3rd/4th highest.

Interestingly, it's much easier to climb Everest than K2 (second highest peak). Death rate is one per four who reach the summit (91 deaths total).

Running is a very high injury rate sport. Depending on what study you look at, novice runners has an accident rate of around 3.3 (that requires medical attention) per 100h of running. It is not without its own risk. Lower risk than climbing Everest or visiting Titanic, but still fairly high risk activity in a city environment with city traffic.

Swimming is a bit better if one want to a lower-risk sport.

Musculoskeletal overuse injuries requiring some level of medical attention are pretty common in every endurance sport, including swimming. But the number of people who actually die due to running accidents is miniscule. We usually have a few deaths every year in open water swimming and the swim portion of triathlon races due to medical issues like heart attacks and immersion pulmonary oedema.