Bro! No point in being CEO if you ain't well enough to enjoy!
I recommend Plank Workout and Home Workout apps. They start with just 4-5 mins and will slowly build up. Even if you can't hold or do whatever for the allotted time, just simplify or wait 'til next exercise.
10-15km steps should be minimum for a day - get some headphones and escape the screen. Good luck!