I have riser bars on my bike, these allow me to get into proper position without leaning over too far and putting too much pressure on my hands and shoulders. Have someone watch you, or better yet, take a video of you riding and see what your body is actually doing. I've learned the hard way that even if it FEELS like my spine/shoulders are in a neutral position it doesn't mean they actually are - we can't always go with how it feels. You may not have this problem, I doA video might give you more information, especially uphill.
I USED to pull on my bars going uphill until I realized what that was doing to my neck and shoulders. I now focus on being in the right gear, relaxing, and just getting up that hill. I DO, however, have neck/shoulder issues that makes this the best approach for me. This actually gets me up the hill faster than my old approach.
Electrolytes are different salts and chemicals your body needs that we lose in exercise - especially if it is hot/humid and if you aren't already getting enough of them in your diet this can cause a problem. Hot/humid riding makes this worse. NUUN tablets are popular. I happen to like Skratch myself, but that is an expensive experiment.




A video might give you more information, especially uphill.
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