Originally Posted by
Jughed
Weight lifting should be done to failure.
This is, generally speaking, not correct.
What about intervals?
asking because I just failed miserably on my second 20 min Z4 interval and feel like it was a waste… but in weight lifting it’s what should be done.
The general rule is that you want to leave one in the tank. I.e. you should be pretty confident you could do at least one more interval. Of course, this is somewhat subjective. If you're doing really long intervals, this may not be the case.
Also, sometimes, but not often, you do want to go absolutely all out.