I have a couple of questions about canoeing down a river. I canoed with a friend for 15 miles and it took 3 and a half hours. The river was pretty shallow (2 to 4 feet deep) and while we had to navigate through shallow water, rocks and tree branches, it was relatively calm. Is it true that the person in the back works harder (exercise-wise) than the person in front? He weighed about 50 lbs more than I do, but I'm in better shape than he is. He says he was exhausted afterwards and that his shoulder hurts... which I think is from improper technique - he should have paddled using his core muscles rather than just his shoulder. Who is correct?
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