The top one with the male is called, "Doing a dumbell deadlift with terrible form". The bottom one, with the woman, is called "A dumbell deadlift with decent form". Notice that the woman is keeping her lumbar spine in almost a neutral position (though not quite), while the man is letting his lumbar totally flex. You will find the beautiful people on Youtube, such as this hunky dude, who will say that it is beneficial to let your lumbar spine flex. However, anyone who has been coaching for a few decades will tell you to keep your spine in neutral. Here are some names for you too look up: Stuart McGill, Mike Boyle, and Brent Brookbrush. McGill and Boyle were coaching when the guy in this picture was in diapers. Brushbook is younger. McGill has published two hundred research papers and three books. There is a long list of professional athletes who have gone to McGill for their back pain. Point is, any coach with a long track record will tell you that letting your spine flex in a deadlift is a bad idea. So you can take your advise from a guy with an expensive haircut, or from people with experience.
Chris
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