The physical labour would probably have a lot to do with it (or maybe you were just born awesome?). The average child these days is discouraged from doing anything that resembles hard physical labour, and grows up to get a desk job where they further avoid hard physical labour. For them (and this becomes truer the older they get, as I've observed), even getting into a half-decent set-up for a deadlift (or any bent over movement) tends to take a lot of coaching. Most of them have never lifted anything more than 20kg without help in their lives and have no concept of bending at the hips.
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A lot of the people here seem to have really good starting points to begin with and have demonstrated in this thread an apparent inability to comprehend that anyone has a worse starting point than them, will need more work just to get competent in the movements they're doing, and even with good coaching, good form and a good diet and exercise program will have a much harder time obtaining the numbers listed in this thread. I have a lot of respect for the physical capabilities of a lot of the people in here, but some of the attitudes seem rather arrogant. "If I can deadlift 200kg after a couple months training, why can't you?" Maybe because most human beings aren't you.