Bicep involvement in the pull up

Don't just retract scapula but retract in the right time.

https://www.youtube.com/watch?v=uLO5EsWXqxc

>>38838492
Forgot to say:

>I do pull ups while keeping my spine vertical I feel like the limiting muscles are my biceps not my back.

I had the exactly same problem last year and I'll repeat the advice they gave me that really worked. Just keep doing the pull ups and the biceps will catch up.
I know you are asking how to use most of the back but anyway if you have a problem with your biceps keep doing L-pulls and one day the biceps will stop lagging. Today I can do the 5x5 L-pulls.

>>38838566
No what I am asking is how to use the most bicep. I really dont like doing curls and would rather just hit my biceps with compounds.
>>38838522
So this would be a pull up that has the most back involvement correct? so would this pull up have more bicep involvement https://www.youtube.com/watch?v=hHdD5Ksdnmk

>>38838592
Why not just do chin ups as well? I alternate, chin ups one session pull ups the next.

>>38839476
This. The fuck are you trying to isolate biceps in pullups when chinups directly targets them sumbitches?

>>38839500
>>38839476
Chin ups are primairly a back exercises.

>>38839633

So are pullups.

You'll never be able to make pullups use more biceps than chin-ups. That's just the nature of how the biceps work (ie barely, if the arm isn't supinated).

>>38839649
Ok so would the L-sit technique work for chin ups?

>>38839672

Maybe. But I wouldn't think so. The biceps can't really take over the lats job, being too upright would be moving more of the work onto the upper back from the lats rather than putting it on the biceps.

>>38839705
Thanks.