Powered by a motor, the Life Fitness PowerMill has one of the widest range of speeds available on a climber. Most other climbers have generators which control the speed of the steps but require a certain amount of force to get moving. This force largely comes from the bodyweight of the exerciser and keeps lighter users from being able to achieve higher speeds because they simply don’t have enough weight. The motor driven PowerMill does not have this issue, making the entire range of speeds available to users regardless of their weight. ​