Adjust the height of your front end while on the trainer with one or more of the Saris Climbing block, the most innovative riser block on the market. Just because the floor of your house is flat, doesn't mean your workout has to be. The Saris Climbing Block offers three height levels, and 2 can be stacked together for 12 different elevations! Surprise your friends on the hills this spring when you break out muscle groups that they can't match!