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Knee pain from weight lifting is very common. I read it's possible from doing squats. You should consult your gym instructor and if the pain is...
From the Green x it looks like your pain is UNDER the knee . Am I right ? Still if I got it wrong you can get some information about knee problems...
I tried to practice with angle weights and found it very uncomfotable. What I did is some workout with the wrist and ankle weights with some tips...