Feel the burn with the GoFit ProGym Extreme training kit. It comes with 4 resistance tubes that allow 12 weight combinations up to 140 lb of resistance so you can increase or decrease the intensity according to the muscles you want to work out. Heavy duty carabineers, rubber tubes, solid metal connection rings, reinforced door anchors, padded ankle straps and durable handles keep you geared up to add some challenge to your strength-training routine.