Assuming not working out vs. working out for 150-200 calories burned 3-6 times a week, you would gain (assuming the entire surplus went to fat, @ 3500 calories surplus -> 1 lb fat gain), 13.37 to 35.66 lbs of fat, which assuming starting at the US median adult male weight of ~200lbs, is a gain of 6.7-18% of starting body weight, all in fat, which would, especially at the high end but even near the middle to low end, be "a bunch of fat".