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It is ridicolous that people think leg curls are inherently bad. Leg curls are often a big part of preemptive work or rehabilitate work for knee injuries.
I was given a program including curls to deal with a case of runner's knee just a couple of weeks ago.
Those aren't curls lol. Extensions mate. Also Cain was doing them a much higher pace and shock loading by 'throwing' massive weight around. Paulo is demonstrating much more control.