It is true because if you train to hard you are gonna get overload syndrome.
Heat exhaustion symptoms can include:
Fatigue
Nausea
Headache
Excessive
thirst
Muscle aches and cramps
Weakness
Confusion or
anxiety
Drenching sweats, often accompanied by cold, clammy
weakened heartbeat
Dizziness
Fainting
Agitation
Heat exhaustion requires immediate attention. Even though, it is probably the least severe heat — related illness.
