re: Workout routine for severely out of shape 50 year old male

Take it easy to begin.

Use a beginner program to lift weights. Maintain proper form and don’t do more than the basics of the program.

Walk 10 minutes a day for cardio. No more for a few weeks. Combined with lifting, you’re going to be tired and sore.

Eat a high protein diet but I wouldn’t do anything drastic like keto at this point. You want to kick your sugar habits and cut back on calories without getting miserable.

Check back in four weeks and see where you’re at. You’ll be pleasantly surprised and yearning for more IMO.