Lower the expectation of doing anything personal in the first couple of years. When baby goes to daycare you can start some physical training to build up energy reservoir.

I think it's more about not enough energy than not enough time. Once the baby is sleep trained and goes to daycare you will have some free time but will need some energy to do anything.

I have a two year old. Although I do have some free time I have zero energy. I wish I went through some rigorous physical training before.