This is a theme puzzle with the subject stated below. Find the listed words in the grid and when you have completed the puzzle, there will be letters left over. They spell out the alternative theme of the puzzle.
Abseil Agile Altitude Andes Ascend Avalanche Base
Buttress Cairn Cam Challenge Chock Climb Cool
Crampons Crimp Down Elvis legs Foothold Gaps Glacier
Solution: 30 letters
Goal Haul Heave Ice Leader Peak Posts
Precaution Reach Ridge Rugged Shelf Slide Slope
Snow Solo Spike Steep Top