Quote:
What if I lift a jar of pickles after my workout, will my body fail to adapt because it is already strong enough to lift a jar of pickles?

I love that!
Baffled , I use the "total work" approach on some exercises and the "when I've hit failure, I'm done" approach on others. There are a lot of exercises I just don't want to go to failure on. I no longer have a totally reliable spotter for bench presses and my chest (not including boobage) is plenty big. I don't lift to failure when I do presses. Same with shoulder presses. I'd like bigger shoulders, but I'd also like to keep my tendons intact. Squats are another exercise I will no longer due to failure. I don't go to failure on barbell clean and presses. I like my teeth in my mouth and my jaw intact. Getting injured is really counterproductive. For those, I do a work expenditure type scheme.
Push ups and pull ups, on the other hand, are quite safe to do to failure. Not too many ways to get hurt unless you REALLY fail at a push up and need dental work! Same with lunges. You aren't going to land in a heap with a pile of metal on top of you.
Today I used machines for the first time in ages to do lat pull downs and seated cable rows. I went to failure on both because it is completely safe (and it's wierdly fun to let the lat bar pull ME up in the air on the last rep that I can do!).
Mel