how to just calculate in place for Fitness dumbbell training? From the point of "the targeted muscle", may be you are in the gym and do gain shaping resistance training class. In fact, we want to clear that, resistance training is not only emphasizes the load (weight), also stressed the depth of muscle stimulation.
For beginners, muscle ability inferior to fitness level, often muscle exhaustion, but also is very normal breathing (which is often said that the heart rate, value may not be particularly large). Through the day-to-day training, muscle to muscle endurance are gradually improve, gradually will also found that when they want to do real "exhaustion", finish will be very out of each group, because your heart rate has soared.