“He knows that the direct rays from the sun will slow him down, even if he wears sunglasses. Nevertheless, Robert is determined to complete his climb.”
“Outside the cabin, the early morning mist was now beginning to rise and clear as the sun continued its climb into the sky.”
climbing
(uncountable) The sport of climbing, ascending a wall or a rock or another object using available holds, generally with the safety of a rope and belayer.