Solved

Trening fizyczny.

Witam mam pytanko czy jest możliwość trenowania kierowcy tak żeby podczas treningu fizycznego dodawało punkty do wytrzymałości a nie zbijało wagi? Jeden z moich kierowców waży już tylko 55kg a ma tylko 8 punktów wytrzymałości. 

Niestety, to system decyduje który aspekt treningu fizycznego jest wykonywany. Trenuj dalej, wytrzymałość też zacznie mu rosnąć.

In Training you can regulate 3 sectors Driving skills-Mental-Physical

If you select Physicist, he will go to train resistance and weight, the development will alternate, it is not possible to train only resistance or only weight. . however, it is good to bring resistance to 20 and weight (46 kg women and 51 kg men) first. . a driver who weighs 80 kg for example slows you down on the track. . they are 30 kg more and they are not few

Can't agree. I read this post at the beginning of my adventure with iGP and it was very helpfull. It was edited mamy times and now says that driver weight isn't important. Look: 
https://igpmanager.com/forum-thread/8281

"Edit 11th August 2019: A manager with many years experience has recently carried out tests, the results of which suggest driver weight currently has no effect on lap time. However, it is still recommended that drivers are trained in "Physical" to reduce weight because once all of the other trainable attributes (everything except Talent & Experience) are maxed it is not possible to further reduce driver weight."

So?

Driver weight training fix
10 Paź 2019, 01:00 Drivers

This patch addresses a specific issue with driver training for high level managers, whereby if the driver's attributes were all at maximum then their weight could not be trained (reduced further).

Fixed driver weight training when all other attributes are at maximum
So??
my experience and tests to analyze and claim that the driver's weight does not affect lap times. If it were so we would all have women in cars. Two drivers with different cars achieve similar lap times. Sometimes even heavier is faster.