I just can’t think how muscles in the back can help to pull you up during exercises like pull-ups.
I get why biceps help during this, but not your back.
Are they connected in your armpits or something?
In: Biology
Stargate gave a good answer already, but I’ll add an experiment you can do in the gym:
Go to a pull up bar (assisted pull up machine if you need it). Grab the bar and hang loose. Look up at the bar, and then just squeeze your shoulder blades together. You’ll notice that you not only lift up a bit, but the rest of the pull up will feel a bit easier. “Activate” the back and “pull” with the shoulders and back muscles, and this will take a lot of the strain off the bicep and distribute it to more and larger muscles.
I think at least… I’m no expert, but this is just how it feels when I do pull ups this way.
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