Numbness and tingling upon flexing and holding the elbow can indicate a secondary issue related to the ulnar nerve.

“if if that starts to cause numbness and tingling in your hand then that's a secondary you will have already probably told me yeah you know I get this I wake up with my hand on a nerve quite numb and that's we all tend to start out this way and end up this way and the only problem there is that that can happen to any of us but if it's regular and frequent and lingering or if we get it when we're typing or playing a piccolo or a cello then um then that's a then that's a different issue”