How would you split this room? With floorplan

[Mrsladybirdface]

We have a large converted garage room which currently acts as a gaming room and gym and occasional office. First World problems but it is too big a room and just looks awful. I hate the treadmill but it has to stay and as much as I have googled "how to hide a treadmill" no good options come up.
I would like to split it to make a cinema/gaming room and then a seperate gym space. Luckily it has two windows, I'm not sure if to just split it half and you go through one room to get to the other or to create two seperate room with a lobby splitting them.
The floorplan attached has the window on the west wall too far across and actually this distance to the window is 2.5 metres. So the rooms would be evenlyish split.
Any advice welcome

Not sure I'd bother with a lobby. I would split the room somehow but difficult to say how without a more accurate drawing of window placement.

I think I'd just split it in 2 horizontally and put a door to the least used room (gym?) on the right hand side.

I think a lobby would make it very awkward and small.

Not a fan of making rooms smaller. It is difficult to know what you have already in your house or if it’s just the threadmill. Downstairs en-suite guest rooms are always a plus for elderly or keeping guests separate from more private areas. If you have the money I would make the cloakroom larger with a shower for showering off after exercise. You could even have a lockable door from this showerroom so it’s got two entry doors. You can get fancy locks for this so only one open or you can just have obvious locks. You could split the front window if you pulled the wall over enough. Then the bit still next to the front is the area for the treadmill- you could have a screen if you wanted. Darkest wall is where the big screen should go (in red). Big sofa looking at screen(not at treadmill).

It would be much cheaper to get a folding treadmill and then fold it and wheel it into one of your closets when not in use than it would be to awkwardly divide the room.
www.gymequipmentsuperstore.co.uk/cardio/treadmills/folding-treadmills

Would be more costly but you could probably rejig the loo so that it is horizontal rather than vertical (so both toilet and sink are along the bottom wall, with an outward opening door), and use the space gained to put a doorway through to the bottom room from the hall. You'd lose a little space in the bottom room to extend the loo, but not much.

Putting in a stud wall wouldn't be overly expensive and it can be removed if a subsequent buyer wanted to.

Thanks everyone.

Just a bit more info, we have plenty of space elsewhere, it more this room feels wasted.

The treadmill is my DHs third child and required to stay!

I think a single wall splitting the room horizontally is probably the easiest and sensible options...perhaps with pocket doors?

I've attached images of a house near me which has converted a similar sized garage (and gave me the inspiration)but they have been able to make the entrances more flowing, which we wouldn't be able to.

Maybe the question should be how do I hide a treadmill😂

Can you move the sink in the bathroom to the corner and make a doorway through taking away the cupboard. A horizontal wall across the room with a doorway between means you will have access to each room but can also get to the gym through the small bathroom