The no-impact nature means there is less stress placed on the joints. The Best Combination of Raw Power and Precision Design. This reduces friction resistance, consumes less energy and attains a far lower starting friction level than all other conventional bearings. Simply lock the bar into position and add your weights. The no-impact nature means there is less stress placed on the joints.
Smooth operation is the key.
It's superior to a free weight machine because it's safer for muscles and joints and can be.