A quick web search will find plenty of research and opinion (eg: 1, 2, 3, 4) that weights-based resistance training is a more effective method than cardio-based workouts for burning fat, even before the advantages of increased muscle mass and improved bone density are taken into account.
But a quick look round many gyms suggests that a lot of people are squandering the advantage and simply wasting their time.
No ‘bro’ or alpha male (from whom so much weight-training advice originates) ever likes to admit that he’s doing something wrong (or be told to put his weights back in the rack) so bad form gets handed down and propagated like fake news.
Trying to show off with the heaviest weight known to man (and woman) is probably at the root of most bad technique and a quick physics refresh explains why: The greater the mass of an object, the greater its inertia and momentum. In other words the heavier the weight, the harder it is to move and, once moving, the harder it is to stop.
The easiest way to overcome inertia is to swing the weight back and forth rather than lift it from a still, standing start in order to give it momentum, so often seen with exercises like bicep curl, lateral raise and leg raise (below).
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