She’s not a man!
News flash – your bride is not a man. Okay, it’s not news, but what does seem to be news to some men is that women are generally not as physically strong as men. I know that’s not a politically correct thing to say, but it is a scientific fact. There are exceptions, but they are rare. (In one study of college age men and women, it was found that the average non-athlete guy had greater upper body strength than the average female athlete.)
I bring this up to remind you that if she is working with you on a physically demanding project, you do her a great injustice if you expect her to do as much as you do. At some level the effort is beyond what she can do without injuring herself, and at a lower level of needed strength she will be exhausted much faster than you will be.
So, do the heavy lifting, and keep an eye on her energy level. Protect her from getting hurt or worn out.