The best exercise is the one that you can get yourself to do regularly.

Come up with any sort of plan that sounds good. Make sure it's super easy. So easy that there's no way you can't stick to it. Then do it!

After a couple months of building this new, easy habit, add to it a little bit. Not much, just another small step in the right direction. Repeat as necessary until of you have all of the new habits that you wanted to build.