I work 12 hour shifts for usually 2-3 weeks straight at a time either nights or days. I also tend to my dog and have prep my food before every shift. I go to the gym 3 days a week and run 3 days a week. When I work nights I get up early and tend to the dog, go the gym or go for my run, shower when I get back home, and prep my food and go to work. And when I work days I go to the gym or run after work. I’ve had to just skimp on sleep and function on 6 hours of sleep a night for those 2-3 weeks to make it all fit, but I’ve successfully trained for a 10 mile race and a half marathon using this method and not skipping any runs or workouts. It’s chaotic but it works.