Muscle Failure with the Bowflex?
So, I have started working out this week. Three days so far (Monday, Wed, and Friday). I have a question, though.
When exactly does "muscle failure" happen? I have read that I am to do an exercise up to 13 reps OR until muscle failure takes place. I noticed today, for example, that doing the bench press, by about 8 or 9 reps, I really started to "shake". Is that muscle failure? Or would muscle failure actaully take place when I simply cannot lift anymore?
It would seem that failure would happen once those particular muscles simply cannot do it anymore without help from the rest of the body. Anyone know anything about strength training and when actual muscle failure takes place?
Thanks
Chris