Abstract: An adapter for stationary exercise equipment that connects to stationary exercise equipment and adapts such equipment to laterally tilt in order to naturally and realistically simulate the leaning that normally occurs during actual vehicle use, such as during actual bicycle riding or boat rowing. The adapter is comprised of a platform or frame, with elastic material underneath, and arc-shaped supports that are shaped and positioned such that the platform tends to tilt away from the horizontal when a user is aboard the affixed stationary equipment, unless corrective forces are applied during use in order to maintain a horizontal position.