How to cook a Tender Roast Beef from cheap cuts

I googled cooking a tender beef roast.... looking for the best method ... and found this web site which talks about the science of cooking beef .... after internal temp of 122 degrees the tenderness stops and the tough roast begins..... clearly a low temp and long cooking time is the best method.... even for a frozen roast! see the following site..........

http://www.frugal-cafe.com/kitchen-pantry-food/articles/slow-cooked-roast-method.html

Frozen Roast Beef.... cooked covered at about 180 degrees for 9 - 10 hours.... in your favorate liquid....