Top 3 Most Strenuous Feats

I went rock climbing tonight with a friend (rare to have a partner nowadays). Thus, I have been averaging once every 3 months or so, instead of 3 times per week. At that rate, the upper body strength is non-existent, but at least some technique is not totally lost. Anyhow, tonight reminded me of some of the hardest times of my life, which I'm sure I have mentioned in the past, but I'd like to list the top 3 here- not sure if it's in random order...

Climbing/hiking overnight on Mt. Fuji, tallest mountain in Japan
(breathtaking sunrise at the top)

My first (and only) backpacking trip through Kings Canyon

Rock climbing indoors since I never had upper body strength
(and especially outdoors without rope, albeit only a few times)

Q: What's your most strenuous feat?