So when I play the lower strings (e and a) , my left wrist keeps bending. It’s like my wrist is bending because my left hand feels so strained when trying to hit notes on the thicker strings.
Does anybody have any advice on how to deal with this?
I developed tendonitis in my left wrist after having long practice sessions after a few consecutive days. I found that I was bending my wrist too much, which really was limiting the movement in my fingers in addition to causing pain in my wrist and forearm. I made things worse by pressing hard with the back of my thumb while fretting with my fingers. I found I had to raise my bass strap a bit (I like to play standing up), I had to pull my left elbow back while I was playing to straighten out the wrist while fretting, I started micro shifting more instead of trying to stretch my fingers a finger per fret low on the neck. This video helped me out a lot, I have seen it posted in other parts of this forum.
So for me, fretting with bent wrist is bad, squeezing neck with my thumb bad, bass too low bad, straight wrist good, bass higher on body good, light thumb on the back of the neck. Hope this helps.
And what @Vegaswizzle said, lower action is easier to fret, takes less finger strength
Can you post a photo of your hand posture fretting the 1st fret of the E string?
Edit: I am below average height with short fingers but can still get a pretty comfortable hand position on the bass.
Well you can do one of 2 things to start or both. Bring up the neck to about 45* it would straighten up both your wrists playing angles and action. Then buildup strength on your wrist.
I love the look of the neck in almost horizontal position so I’m constantly fighting extra strain on my left wrist when I strap up my bass. That said on my six string I tilt it up a bit.
I had this, my wrist was bent so far. Playing shouldn’t hurt. Lots of good advice from these folks here. For me, it was resolved by bringing the neck up
I did a YouTube search for wrist stretches and found a bunch that helped (no specific suggestions because you really need to be the judge of what works best for you).
Doing them throughout the day makes a huge difference pretty quickly.