Definitely. I've recently started exercising more. My bare minimum commitment to myself is to walk a half an hour a day. I regularly do more, but if I only do 30 minutes I don't feel guilty. No matter how long of a day I've had, I'm never too tired to walk for 30 minutes. It's also a good way to build self control through habit.

I would rate my life satisfaction as at least moderate, but is nothing about being alive that could possibly justify the experience of exercise, particularly of running. Given the choice between a lifetime of regular running or death, I’d choose death without even blinking.

You would be missing out on some great experiences. Running is what humans are good at: our bodies are evolutionarily adapted for it. It makes you feel good. Yes, running is hard at first, if you're sedentary. But I can assure you that regular running is considerably more enjoyable than death :)

Indeed, an early morning run or swim will wake you up better than caffeine will.

As can being beaten with a baseball bat or shocked with a cattle prod, but fortunately we’ve found a mechanism other than pain.

I started playing tennis twice a week (would like to do it three times but those are the group times) and I love the difference. Aches have completely gone away, and I feel much fitter overall.