Your rower should not be unstable when seated or the machine is in use. Your rower may be equipped with rear leveling caps that can be adjusted should the rower sit unevenly on the floor. Should your rower need to be leveled, turn the leveling caps until the rower sits evenly on the floor.
Note: Not all Spirit rower models are equipped with leveling caps. If you notice that your rower is unstable, relocate the rower to a location with an even surface to avoid personal injury and operational damage to the rower.