Death would be one…dying is generally not the optimal condition for muscle growth.
Can’t you open the doors or something?
Death doesn’t sound good. I feel good when training - I would hope that I would get some warning signs before dying.
Occassionally I open the door to get some fresh air for a minute, but generally I keep it closed for two reasons. First, I blast my music and I don’t want to bother the neighbors. Second, I don’t want to draw too much attention because a city ordinance for my area dictates that you can only have cars in your garage.
Many of my neighbors use their garage for other purposes as well, but every now and again city officials come by and create a hassle. About 6 months ago my neighbor had to clear out his garage because he was using it as storage - and I don’t want lose my gym.
That’s one fucked up town to be able to tell you what you can or can’t put in your garage.
Buy a fan. Drink shit tons of water.
I train in the back of my office building, and I hate turning on the AC back there for only an hour - if that long. It get’s pretty damn hot especially this summer. I think it’s been at or near 100 degrees almost everyday since the 1st of June.
I turn the fan on high, drink a bunch of water during my workout, and step outside for some fresh air between body parts.