I would say without assistance!
Really simple and quick question, is it considered going to failure if you can complete the last rep without assistance, or is it only failure if you cannot complete the last rep and need assistance.
I would say without assistance!
If you complete the last rep, without assistance...how is that failing?
failure = FAILING to complete the rep
"Everybody wanna be a bodybuilder, but don't nobody wanna lift no heavy-ass weight!" - Ronnie Coleman


Concentric muscle failure is defined as being unable to complete the concentric (positive) portion of the next rep. Your muscle is too exhausted to move the weight.
If you get assistance you are decreasing the resistance, in effect making the weight lighter, so you can perform another rep.
I don't like assisted reps because you're muscle is obviously too tired to lift without help, and so shouldn't be pushed any further. Risk > Reward IMO. I would save myself the CNS burnout, personally.
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If you can't do another rep, then you went to failure. How do you know? That comes with experience b/c you just have to know where your limit is by feel, unless you want to get stuck under a few hundred pounds. In other words you stop BEFORE you attempt that rep that you can't do.
Now, with curls and pulldowns and the like you can try the next rep and just put the weight down if you can't complete it.
With bench and squat you just have to know (unless you have spot)
I lift alone and have ben liftin for years so I know, sure sometimes I'm not sure and rack the weight 1 rep shy of failure, but that's still plenty intense.
BTW, don't use collars if you lift alone.
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