So my back and legs are my best body parts, and by far my strongest. I've gotten to a point where I can max out all leg machines for 30 reps or more, as far as back goes, the cable row only goes up to 250lbs which is fairly light with a 4 cable system, and the dumbbells only go up to 100lbs. This forces me to do 10+ sets of squats or barbell rows before I move on to anything else which restricts my routine. Any advice on making the weights "heavier" would be appreciated.