The StrengthErg is powered by Concept2’s signature flywheel technology, which can be varied in intensity depending on the combination of the damper setting and the amount of effort the user produces. The responsive nature of air resistance results in a variable load depending on the user’s strength. A lower damper setting, or less air resistance, produces a lighter feel when pressing or pulling. A higher damper setting, or more air resistance, produces a heavier feel when pressing or pulling.