Question

weight lifter apply a lot of powder on their palms, before weight lifting. why?

Answer 1

To avoid the problem of sweaty hands 
Baby powder or chalk is used to improve grip by absorbing moisture on the hands.

Answer 2

Answer:

Weightlifters use chalk on their hands to dry sweat and other moisture, increasing friction and enhancing their hold grip.

Explanation:

• Weightlifter usually dust their hands with chalk powder to absorb sweat and enhance their grip strength by reducing friction between hands and rod.
• Weightlifter's sort of chalk powder is called magnesium carbonate, a white solid that exists in nature as a mineral magnesium carbonate is usually distinct from the chalk that is used on sidewalks and blackboards.