taking breaks is a big deal, and hard because all i wanted to do when i started was keep playing. and you can look up and 3 hours has passed really quickly.
You don’t want to lead to tendonitis in hands, or shoulders/wrists etc.
Going easy will get you to longer playing a lot quicker than overdoing
My hands start to hurt after 10 minutes of non-stop Billie Jean 
So does my head 
Actually am having the same issue with left hand/thumb pain. Breaks are helpful of course. Wondering if anyone has any good exercises/stretches for the hands to keep them in good operating order. Worth a new topic perhaps?
I still have no idea exactly how my left hand/wrist/etc are supposed to be postioned. Every time I try to emulate what folks show on line its undoable.
A good thumb stretch is to touch the base of your pinky with your thumb, and then return it to its normal position at the side of your palm. (Repeat as many times as you like.)
There’s a bunch of other stretches as well that I’ve been doing regularly. A bit long to explain in writing, but I can try and summarize them if you want.
I developed some soreness in the past few days so I took yesterday off, which was hard to do because I’m trying to complete the course in 30 days. I’m actually proud of myself for forcing myself for not playing because my younger self would have pressed on. I know I press too hard with my thumb. The pain is at the back of my wrist toward the right side. I also notice I have sore forearm muscles on both sides. I’ve been trying to massage and stretch. Any exercises/videos would be great. @ArcticMonkeMan mentioned “level five finger exercise from Josh’s video”; if they or someone else could point me to that video I’d greatly appreciate it.
@howard, thank you so much for this video!
I have been beating myself up for not having my thumb behind my middle finger like I have read in so many places, but what I am actually doing is keeping my hand in the neutral postion as he points out!
What I do need to work on is getting up on the tops of my fingers vs. too far down the pads.
This is very helpful!
I’m convinced that video saved me from an RSI.
Yeah, I love that video. Here is another great video about holding positions and overgripping.
Right arm resting on the body of the bass - Check.
Nice comfortable wide strap - Check.
Not having to “push” with my left thumb whilst fretting - OH CRAP. LoL
I knew I was hurting for some reason!
Thanks @JT!!
PS - Love Ariane. Pretty technical on most of the stuff I have watched of hers, but I enjoyed it. And, I have her iTunes version of “Cello Suite #1 in G Major, by Bach” played on an Electric Bass as my arm clock each morning. 
I was similar. Not pushing hard with my thumb, but found it hard to play while not using my thumb at all. Been trying to get better at that and slowly improving.
Yep practicing for a few minutes at the start of every session without using your left hand thumb at all is very helpful.
I had no idea until playing after watching this that my thumb is doing so much pushing!
One more thing to work on…its a journey for sure!
The infamous death grip is certainly part of the journey and will pass pretty quickly if you watch what you’re doing.
I certainly went through it , asked the knowledgeable community here and got over it eventually. And just to give you some idea how bad it was I struggled to slide my thumb up the back of the neck when I was playing 
If your hand/arm starts to hurt. Stop. For a bit. Let yourself recover. Increments. Breathe like Josh says you should… I swear he is talking to just me exactly when I am holding my breath :). But seriously don’t ignore pain. It’s there for a reason. I overdid it practicing and now I wear a copper fit brace like Brett Favre…not happy.
+1.
Definitely do not try and tough it out through injuries. Pain is there for a reason.
