Beat the heat 

Always during workout make sure that the room has enough ventilation

Air Conditioning is not important at all, since it might avoid sweating.

Please so sweat. For that air conditioning is not required at all. Ventilation is.

Ventilation is different than air conditioning.

It just carries your heat away by method of convection by air which is natural and your body will have sweat which is natural again

So stay natural.

Nowadays all the gyms are closed and indoor without fresh air. You also cannot avoid gyms since they have the right equipment for workouts and you cannot change the air conditioning system of the gym.

So what you can do is stay inside the gym only for 1 hour and then get out of here.

Stop gossiping with your friends there after workout

Gets some fresh air after that while having a simple normal paced walk, not brisk walk for a few minutes!

Sleep at right time and give your body the right amount of rest.

Your muscle only gets pumped up while working out

The real growth of muscle takes only while you rest with some peace.