Common response to a midlife crisis, honestly. I was hit hard by spine injuries in my mid-30s and, frankly, almost ready to end shit if not for my wife and the hope of treatment. Years after recovering from all the surgeries, now in my 40s, I've bounced back hard in the other direction. I take Sundays off, so not literally every day, but I lift 6 days a week for 60-90 minutes, walk for 30-60 minutes every morning and 60-90 minutes every evening, row reasonably hard 3-4 days a week for 20-30 minutes. As far as I understand, the average American spends 3 hours a day watching television, so it's not like we don't have the time. I just don't do that. Plus, I work from home, so I'm not blowing an extra 3 hours a day on commuting and taking a lunch break.
It's now or never. It's not like it'll get easier in my 50s or I'll get another chance in the next life. We've only got this one.