As a person who is pretty new to remote work, I can totally relate to this!
I'll typically take a big break in the middle of the day and do something active paired with a small lunch (I snack pretty frequently during the day, but keep my snacks downstairs, another trick to get me up and down a few times). The physical activity keeps my stress down and it's a nice change of pace. Also, I find if I don't move my body around enough, I get really sleepy toward the end of the day. A midday workout is often what I need to get that extra jolt of energy!
Another tip that I use for myself is to keep on a schedule. I'll take my lunch/gym break some time within the window of 12-2. I leave a little flexibility there depending on how much work I have going on, but this is generally when I like to take my extended daily break.
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