I would be cautious of making decisions based on the mean value of some workplace-related social sciences study. Many software engineers, data scientists, and other knowledge workers can work remotely and have very flexible hours. We also often work on exciting, stimulating problems that are just fun to solve. These are privileges that we should use.

I like going to the gym on a weekday when there are fewer people around or go for a run over lunch break and make up for it on Saturday or Sunday. I find it also easier to go into a deep work mode / flow state when I work at times when I don't have to expect a random email or text message.