repost
Rep range The ideal rep range for building size and stimulating hypertrophy is the 6 to 12 reps. Less than 6 reps will more or less increase strength and a degree of size, performing more than 12 reps will help build muscle endurance. Make sure that your reps fall within this range and your hitting true positive failure for the best chance of hypertrophy. If your implementing one of the beyond failure methods such as forced & negs, rest pause or dropsetting you use a weight what is heavy enough to bring your positive failure at the low end of the rep range. An example for rest pause you use a weight what you will hit true positive failure at around the 4th rep then you would rest for around 10-15 seconds and do another couple of reps, then rest again for another 10-15 seconds and hit another 2 reps with the same weight. In total your doing 8 reps which is within range and your going to failure on each rest pause so you have a high chance of stimulating the right fibers to produce the best gains. As your rep range and strength increases towards a total of 12 reps you simple increase the weight being used so your constantly increasing intensity and overload, the two keys principles of any HIT programme. You use feeler sets to determine what weight you will be using on your working set, as you use different methods like dropsetting always makes sure you don't drop the weight to much so your not going over 12 reps in total. If you are you need to be using heavier weight on the drops so your rep range hits below the 12 reps in total. I always like to use around the 8 rep range in total and increase the reps upwards until I feel i can increase the weight so my rep range falls around the 8 rep range again. We are aiming for maximum muscle fiber recruitment hitting these rep ranges at failure will have the greatest potential for muscular growth. The above advice is for someone who is already advanced and is looking to build bigger thicker muscles, its not for someone who is building a base and foundation because these people can really benefit from using a lower rep range aswell as the above.
Feel sets The feel sets are sets what you will do previous your working set, these sets are done so you can determine what weight you will be doing on your working set. Sometimes on my first feeler set it feels light and I'm very powerful so the next feeler set I will put some poundage on and see how that feels, again if that feels easy I know I can go heavier on my working set. I also take in consideration what I am going to be doing whether its forced and negs or rest pause or drops, I just judge a weight what I will be hitting failure around the 4th - 6th rep mark or less and then incorporate the beyond failure protocols. I also remember what I did last time I did that movement because in the back of my mind I know I have to overload my body. I am always pushing heavier weights or trying to increase the intensity
Stimulating growth
Remember going to true positive failure like I've describe previously hits the toughest muscle fibers what grow the biggest these are the fast twitch type 2b fibers, you hit these fibers and you will have the biggest chance of increasing in size. What we are aiming for is progression overload so you keep hitting the muscles with an increased weight so they need to change and adapt to the overload its being put under. This kind of continuous stress will have a reaction on the body and it will have no other alternative but to grow. We keep within the right rep range what stimulates the biggest growth and we continuously try and increase the intensity by increasing the reps then once the reps increase you increase the weight to bring the reps down within the correct range again. I can't stress enough about taking your muscle to true positive failure, this takes a lot of mental preparation. Before any muscle contraction occurs it originates from the brain sending signals to the nerves, the stronger the signal the more forceful the muscle contraction, in other words control your mind set pre working set and you will be in the best position to take your body to failure and beyond. I've commented many times how I go about doing my mental preparation but you master the mental side and you will see huge leaps in achieving your goals. Release the aggression by talking to your inner self and you will take your body to places its never been before. Stimulate growth by overloading your body to a state were its screaming for you to stop and no matter what you couldn't do one more rep even if your life depended on it, if you don't train in this fashion your not training hard enough.