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Most people only burn 150-200 calories when they work out.

If you were eating the exact same and just not working out, you wouldn’t have put on “a bunch of fat” at all. Maybe 10lbs over two years.

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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".

You can’t assume the entire surplus went to fat. That’s nuts.

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