Why is the aesthetic of gyms, even the good ones, always so lifeless? Always black and grey and white everywhere. I want fans blowing air in my face at 12 km/h and a simulation of running along a forest path in a magical fantasy world .... or at least some plants.

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That's my preference. Some places have 30' temperatures though 🙃

You are great person. 
You could buy any park with forest near you and put on any clothes with the temperature you need