ok seen a lot of guys asking and posting questions about certain areas of the body that wont grow. so here is my training method and it works for me. lets say chest is you weak point and its not growing as you would like, I will use this as an example but it applies to all groups that's not growing

chest day 5 different execises

5 sets each
1st set lower weight as many as you can do till you cant do another
2nd set high weight till failure if you get past 6 your to light
3rd lower weight as many as you can do to failure
4th high weight to failure aim 4-5 reps
5th same low weight to failure if you didn't do at least 20 reps then you was to heavy on weight.

this will apply to each 5 different execises

do this for 4 weeks and your chest or problem are will grow, only thing is make sure your eating enough calories and protein intake has to be there for this to work. I have relied on this method for a long time and it works for me and hope it will help you.