When you go down the tightrope quickly, your hands get hot. Explain why this is happening?

According to 1 law of thermodynamics: the internal energy U can be changed in two ways: by transferring the amount of heat Q to the body and by performing work A.
As you descend the rope, the frictional force between the arms and the ropes does the work. Due to the performance of this work, the internal energy of the rope and hands increases. Since temperature is the measure of internal energy, the temperature of the hands and rope increases, they heat up.