From a personal trainer.
The pain in my arms eventually got to a point where I couldn't close or open the trunk of the car, pick up my backpack, or even do exercises other than bicep curls. I asked my personal trainer in our first session what was going on, calling it "forearm splints". He said it's not like shin splints because your shins are filled with a fluid, which has something or other to do with the pain. What he told me to do was to go to a flat surface, sometimes I use my knees when I'm out and about (do it whenever you think about it) dip you hands down (palm facing the floor) to create a 90 degree angle, while the hand moves down close your palm to make a fist, then, bring your hands up in the air opening your palm completely as you go up and go as far back as possible, keeping forearms completely flat on the table, as if you were trying to swat a fly on your forearm with the back of your hand. Apparently, our hands are supposed to be able to go straight up in the air (make another 90 degree angle). At first your fingers will be at different levels because of the lack of flexability, but try to get as far as you can getting that squeeze (the squeeze is important when going down and up, pretend you're reaching for your elbow both ways). Do this as fast as you can, keeping perfect form with your forearms, with as many repetitions as possible, your whole arm should really start to burn, do it till it's unbarable. Redo this a couple times, do it periodically throughout the day. After a week I noticed a difference.
The pain in my arms eventually got to a point where I couldn't close or open the trunk of the car, pick up my backpack, or even do exercises other than bicep curls. I asked my personal trainer in our first session what was going on, calling it "forearm splints". He said it's not like shin splints because your shins are filled with a fluid, which has something or other to do with the pain. What he told me to do was to go to a flat surface, sometimes I use my knees when I'm out and about (do it whenever you think about it) dip you hands down (palm facing the floor) to create a 90 degree angle, while the hand moves down close your palm to make a fist, then, bring your hands up in the air opening your palm completely as you go up and go as far back as possible, keeping forearms completely flat on the table, as if you were trying to swat a fly on your forearm with the back of your hand. Apparently, our hands are supposed to be able to go straight up in the air (make another 90 degree angle). At first your fingers will be at different levels because of the lack of flexability, but try to get as far as you can getting that squeeze (the squeeze is important when going down and up, pretend you're reaching for your elbow both ways). Do this as fast as you can, keeping perfect form with your forearms, with as many repetitions as possible, your whole arm should really start to burn, do it till it's unbarable. Redo this a couple times, do it periodically throughout the day. After a week I noticed a difference.