How to adjust the straps on the sliding platform/bed of the Pilates reformer. Sit comfortably on the sliding platform/bed. Place it in the metal fastener and adjust the belt. Adjust the buckle on the strap. A spring has to be placed on the reformer, so that it stands firm. Shorten the rope to your measurements and until it is tense. Compare the length and tension of the two straps. They must be equal to achieve a good and effective exercise routine.