You don't need a long barbell but you will probably be going heavier than you did w/ the Firm videos because Cathe's strength training is generally at a much slower pace. The sequencing also allows you to go heavier. I'm not familiar w/ the Firm barbell but if you haven't maxed out on the weight you can add on, you should be fine. The shorter length is usually nicer (to the walls, tv, lurking pets) for home use.