If you are over working your elbows....arms and shoulders....then you are not setting the height correct...there should be no weight on your arms the machine should sit flat and the handle rest on the top your leg...just a slight up and down to drive it...if you have it set correct the thing will practically run itself with very little effort from you..there is no real repetitive movement that would cause you any type of Tendinitis.....or any other problems......