Depends how quickly you do it. 10x3 with little rest between sets, obviously using less weight, WILL be effective at gaining size.
Why not try 2 weeks of 3x10, then, do 2 weeks of 10x3 ? I guarantee you that will get good results. [/quote]
The object of 10x3 was to use 80-85% of 1RM and 70-90 seconds of rest between sets. So 10x3 with little rest and less weight is NOT what Waterbury had in mind.
When a coach mentions something that has worked wonders for him you need to try it exactly the way he has outlined it, whether it is counter intuitive or not. If you ‘tweak’ it in any way then you cannot know comment on the efficacy of the coaches program.
To the OP,
A lot of ways have been proven reasonably effective for gaining size that seem ‘odd’ in a way.
Clusters, rest-pause, 6-12-25, giant sets, combos, 100’s, speed reps, slow reps, 21’s etc. etc. so why would 10x3 with 80-85% of 1RM with 70-90seconds rest between sets be hard for you to believe?
And losing muscle? How do you figure that that’s going to happen when you do 30 reps with at least 80% of your 1RM?
By the way, not trying to be combative but I am truly interested why you would even remotely think that you would lose mass this way. Heck, 3x3 with 80% will have you hold on to your mass, even on a diet. Do you ever train with weights at this percentage (using a certain amount of reps)? (again asking respectfully).