I should note I've been doing P90X for about 11 months and I have improved a lot during that time and even customized the routines for myself after doing the first 90 days by the book.
In my P90X weight routines, I've followed these rules:
- 8 to 10 reps on a given weight.
- Once I am strong enough to consistently surpass 8 to 10 reps, I raise the weight by 5 pounds.
- Using the heavier weight, I start over at rule #1.
This method has seemed to work pretty well. However, I find myself getting frustrated when I fail to improve. My goal in EVERY workout is to do AT LEAST one-extra rep with every exercise, OR increase my weight. Sometimes, I just can't do that and my arms turn to jello.
Realistically, I'm starting to think I'm being too hard on myself. Once I did the math, I realized following that philosophy would mean going from 15 pound bicep curls to 40 pound bicep curls within a maximum of 10 months. Put into those terms, that seems a bit extreme.
I guess I'm just posting to get some affirmation - am I being unrealistic? Should I not have such high expectations? Should I permit myself some slower progress? How much have you increased your weights since starting?