I work full-time in tech, have a wife, two kids, two dogs, and work on my book [1] writing every single day. I still definitely have 30 minutes of free time every day to work out.
What I don't have as much of is will-power/discipline/execute function whatever you want to call it. I workout twice a week and run once a week and with that on top of working and writing I really do feel like I'm at the limit of what I'm able to motivate myself to do.
If I wasn't writing a book, exercising even more would be pretty easy.
Try tracking how much time you spend staring at your phone and/or the Internet. Cut that and you'll be very surprised how much long the day gets.