Alternative: slow afternoons? I mean, my routine usually has me start with tech/work at 6am, but I wrap up around 2:30 and put some hours outdoors or in my other hobbies. I think the important part is just not spending ALL DAY doing any one thing. My grandma has a saying - "Everything in moderation, including moderation"
1pm-3pm for gym
3-5pm for reflection, thinking and writing.