Scripture supports a variety of postures for prayer, so that's less of an issue, but the rosary (which is what the beads resemble) are found nowhere in Scripture. Often, beads like those are accompanied solely by memorized prayers rather than an honest outpouring of the heart. If one must follow a "model" for prayer, I humbly suggest building on the frame of the Lord's Prayer and/or using the ACTS frame (adoration, confession, thanksgiving, and supplication). These frames are biblical and allow us to genuinely communicate with God.