Hot weather and humidity

[Shorinryu]

I have noticed that when there is hot weather and humidity, my muscles lose hardness; anyone can tell me why? This occur even if i drink a lot to replenish fluids :frustrate

 

[Iron Warrior]

Maybe you're overtraining under those conditions ? Otherwise it could be that it just makes you feel lazier, I know the summer tends to that to me from time to time.