Upright row is a lateral deltoid exercise. It should be at least. When you do them, you involve a lot of other muscles, suck as trapezius, partly biceps etc etc. these are stronger muscles... this means that u can lift very heavy weight, but that doesnt mean the lateral deltoid can handle his part of the work. Therefore it gets overtrained/ gets to much work, and will get injured.
In other words, upright row is a great exercise if u remember to keep the weight low so u dont overdo the amount of stress u put on the lateral deltoid, even though all the other muscles can handle much more weight...
Have fun
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