Work fewer hours, definitely. If you really can't , more important than doing 1h of exercises is to spread movement over your day. In this regard, Deskbound will probably help you https://www.amazon.com/Deskbound-Standing-Up-Sitting-World/dp/1628600586 This is for you to at least be functional/healthy, not ripped. If you can squeeze a few more minutes in your day, learn to do body weight exercises. Grab a book like https://www.amazon.com/You-Are-Your-Own-Gym/dp/0345528581 (it's ok) and start doing them at home, when you can.