Minerals that I have told you are expelled through sweat may be important for u: in general, #Salt is the least important coz there is #Salt in every food you eat and it can be replaced, but that is not true for #Potassium and #Magnesium.
At outdoor temperature of 40ºC, I do not advise doing sports outside, you may suffer #Dizzness, #HeatSyncope or #HeartAttack, but if you do sports, you probably need another nutrients.