Bowflex 410 lb. Rod Upgrade allows an upgrade select Bowflex Gyms from 310 to 410 lbs. Designed for use on the Bowflex Ultimate/Ultimate 2, Bowflex Motivator, Bowflex Xtreme/Xtreme 2, Bowflex Sport, Bowflex Blaze and Bowflex Power Pro. Prior upgrade from 210 to 310 lbs. is required for Bowflex Motivator, Bowflex Xtreme/Xtreme 2, Bowflex Blaze, and Bowflex Sport models.